| Marshall, Roger W | U.S. Senate | KS | Republican | 2 |
| Marsh, Douglas Philip | U.S. Senate | MI | Green | 1 |
| Marsicano, Michael Paul | U.S. House | PA | Democratic | 2 |
| Marsili, Thomasina | U.S. House | IN | Democratic | 1 |
| Marsters, William | President | US | Independent | 1 |
| Marston, Regina L Mrs | U.S. House | CA | Democratic | 1 |
| Marter, James Thomas | U.S. Senate | IL | Republican | 1 |
| Marter, James Thomas | U.S. House | IL | Republican | 1 |
| Marthone, Joseph R. | U.S. House | NY | Democratic | 1 |
| Martilli, Dean | U.S. House | MA | Republican | 1 |
| Martin, Adam | U.S. House | OK | Democratic | 1 |
| Martin, Andy | U.S. House | NH | Republican | 3 |
| Martin, Andy | U.S. Senate | NH | Republican | 1 |
| Martin, Barrington Deon Mr II | U.S. House | GA | Democratic | 1 |
| Martin, Bradley | U.S. House | IL | Republican | 1 |
| Martin, Brandon Ray | U.S. House | AZ | Republican | 3 |
| Martinek, William Charles | U.S. House | CA | Republican | 1 |
| Martinez Alexander, Diana | U.S. House | TX | Democratic | 1 |
| Martinez, Angel David | U.S. House | TX | Democratic | 1 |
| Martinez, Damon P | U.S. House | NM | Democratic | 1 |
| Martinez, Daniel Jose Bocic | U.S. House | CA | Republican | 1 |
| Martinez, Daniel Jose Bocic Mr. Esq. | U.S. House | CA | Republican | 1 |
| Martinez, Diego J | U.S. House | CA | Republican | 1 |
| Martinez, Elisa | U.S. Senate | NM | Republican | 1 |
| Martinez, Elisa | U.S. House | NM | Republican | 1 |
| Martinez Garin, Carlos A Mr | U.S. House | FL | Republican | 1 |
| Martinez, J. Emilio | U.S. House | CA | Republican | 1 |
| Martinez Johnson, Alexis | U.S. House | NM | Republican | 1 |
| Martinez, Julian Antonio | U.S. House | TX | Republican | 1 |
| Martinez, Selena Rose | U.S. House | CA | Democratic | 1 |
| Martinez, Susan Lynn | U.S. House | CO | Democratic | 1 |
| Martinez, Tekesha | U.S. House | MD | Democratic | 1 |
| Martin, Grant | U.S. House | PA | Republican | 1 |
| Martin, Henry | U.S. House | MO | Democratic | 1 |
| Martini, John Patrick Mr. | President | US | Democratic | 1 |
| Martin, Isaiah Mr. | U.S. House | TX | Democratic | 1 |
| Martin, Jack | U.S. House | FL | Republican | 1 |
| Martin, Maria | U.S. House | VA | Republican | 1 |
| Martin, Marshall | U.S. House | CA | Republican | 1 |
| Martin, Michelle | U.S. House | AZ | Libertarian | 1 |
| Martin, Paul Walter | U.S. House | WA | Republican | 1 |
| Martin, Robert | U.S. House | MA | Libertarian | 1 |
| Martin, Susanann | U.S. House | AR | W | 1 |
| Martin, Terry | U.S. House | IL | Republican | 1 |
| Marty May, Elizabeth | U.S. House | SD | Republican | 1 |
| Martz, Emily | U.S. House | NY | Democratic | 1 |
| Martz, Melissa | U.S. House | FL | Republican | 1 |
| Marvin, Larry | U.S. Senate | NE | Democratic | 1 |
| Marx, Krystal | U.S. House | WA | Democratic | 1 |
| Marx, William A Mr. III | U.S. House | PA | Democratic | 1 |
| Maryott, Brian L Mr | U.S. House | CA | Republican | 4 |
| Marzock, Bret Mr. | President | US | Independent | 1 |
| Masjedi, Nayrika Debora | President | US | NNE | 1 |
| Mason Do (Ret), Dr. John Christipher | President | US | Democratic | 1 |
| Masone, William Anthony | President | US | Republican | 1 |
| Mason, James Gray Mr. | President | US | W | 1 |
| Mason, Jessica | U.S. House | TX | Democratic | 1 |
| Mason, John | U.S. House | MN | DFL | 1 |
| Mason, Mia | U.S. House | MD | Democratic | 3 |
| Mason, Mia Danielle | U.S. Senate | MD | Democratic | 1 |
| Mason, Raz | U.S. House | OR | Democratic | 1 |
| Mason, Robert Carter | U.S. House | TX | Independent | 1 |
| Massa, Eric Jj | U.S. House | NY | Democratic | 1 |
| Massengale, Jeremy Mr. | U.S. House | TN | Republican | 1 |
| Massey, Michael | U.S. House | CT | Republican | 1 |
| Massie, Thomas H. | U.S. House | KY | Republican | 1 |
| Mast, Brian | U.S. House | FL | Republican | 1 |
| Masterman-Smith, Mike | U.S. House | CA | Democratic | 1 |
| Masters, Blake | U.S. House | AZ | Republican | 1 |
| Masters, Blake | U.S. Senate | AZ | Republican | 2 |
| Masters, Paul Michael Drexel Uni Jr | U.S. House | PA | Republican | 1 |
| Mastrianni, David | U.S. House | NY | Democratic | 1 |
| Mata, Jason Sr | U.S. House | TX | Independent | 1 |
| Matemu, Japheth | U.S. House | NC | Libertarian | 2 |
| Matern, Matthew | President | US | Republican | 1 |
| Mathematician, President Quinci Pryce | President | US | Republican | 1 |
| Matheny, David Paul | U.S. Senate | AK | Independent | 1 |
| Matheny, Judd | U.S. House | TN | Republican | 1 |
| Matheson, James David | U.S. House | UT | Democratic | 1 |
| Mathews, Daniel Mr | U.S. House | TX | Republican | 1 |
| Mathews, E. Peter | U.S. House | CA | Democratic | 1 |
| Mathews, Jonathan David Mr | President | US | Republican | 1 |
| Mathews, Peter | U.S. House | CA | Democratic | 1 |
| Mathis, Elizabeth | U.S. House | IA | Democratic | 1 |
| Mathisen, Peter G | U.S. House | CA | NPA | 1 |
| Mathis, Nathan | U.S. House | AL | Democratic | 2 |
| Mathys, Chris | U.S. House | NM | Republican | 1 |
| Mathys, Chris | U.S. House | CA | Republican | 1 |
| Matias, Juana | U.S. House | MA | Democratic | 1 |
| Matland, John | U.S. House | NY | Republican | 1 |
| Matlock, Brian | U.S. Senate | KS | Republican | 1 |
| Matlock, James Lloyd | U.S. House | TN | Republican | 1 |
| Matory, Liz | U.S. House | MD | Republican | 1 |
| Matory, Liz | U.S. House | MD | Republican | 1 |
| Matory, Liz | U.S. House | MD | Republican | 1 |
| Matos, Sabina | U.S. House | RI | Democratic | 1 |
| Matsui, Doris | U.S. House | CA | Democratic | 1 |
| Matsunaga, Matthew | U.S. House | HI | Democratic | 1 |
| Mattammal, Gus | U.S. House | CA | Republican | 1 |
| Matta, Tatiana | U.S. House | CA | Democratic | 1 |
| Mattelin, Caitlin Rae Draper | U.S. House | AR | Democratic | 1 |
| Matthew, Abraham Thomas | U.S. House | IL | Democratic | 1 |
| Matthew, Nick | U.S. House | MA | Democratic | 1 |
| Matthews, Ameena Nuur Ms | U.S. House | IL | Democratic | 1 |
| Matthews, Cole Francis Mr. | U.S. House | NY | Democratic | 1 |
| Matthews, Dan | U.S. House | WA | Republican | 1 |
| Matthews, Krystle | U.S. Senate | SC | Democratic | 1 |
| Mattlin, Meredith Paige | U.S. House | TN | Democratic | 1 |
| Mattocks, Savon | President | US | Independent | 1 |
| Matveyuk, Sergei | U.S. House | CO | Republican | 1 |
| Matyi, Mark Hon. Esq. | U.S. House | CO | NNE | 1 |
| Maul, Lester "Skip" Ralph | U.S. Senate | AZ | Independent | 1 |
| Mauro, D.J. | U.S. House | FL | UNK | 1 |
| Mauro, Eddie J | U.S. Senate | IA | Democratic | 1 |
| Mauro, Eddie J. | U.S. House | IA | Democratic | 1 |
| Mauro, Regina | U.S. House | PA | Republican | 1 |
| Mavis, Neil J Mr. | U.S. Senate | OK | Republican | 1 |
| Max, Caleb J Mr | U.S. House | VA | Republican | 1 |
| Maxwell, James T. Dr | U.S. House | NY | Republican | 1 |
| Maxwell, Joel | U.S. House | NC | Republican | 1 |
| Maxwell, Mary | President | US | Republican | 1 |
| Mayberry, Matt | U.S. House | NH | Republican | 1 |
| Mayberry, Ryan | U.S. House | NC | Republican | 2 |
| Mayberry, Young | U.S. House | AZ | Republican | 1 |
| Maycumber, Jacquelin | U.S. House | WA | Republican | 1 |
| May, Donald Robert Lee | U.S. House | TX | Republican | 1 |
| Maye, Greg | U.S. House | DC | Democratic | 1 |
| Mayfield, Darius | U.S. House | NJ | Republican | 1 |
| Mayhugh, Jeffrey Michael | U.S. House | VA | Republican | 1 |
| May, Justin Tyler Mr. | U.S. House | AL | Democratic | 1 |
| May, Karla | U.S. Senate | MO | Democratic | 1 |
| May, Melissa | U.S. House | CA | Democratic | 1 |
| Maynard, Christopher | U.S. House | WA | Democratic | 1 |
| Maynard, Jackson | U.S. House | WA | Republican | 1 |
| Mayock, Frederick | U.S. House | MA | Independent | 2 |
| Mayock, Frederick | U.S. Senate | MA | NON | 1 |
| Mayo, Jordan Ashlee | U.S. House | MD | Republican | 1 |
| Mayon, Ramona Elizabeth | President | US | W | 1 |
| Mayon, Ramona Elizabeth | President | US | W | 2 |
| May, Pam | U.S. House | MO | Democratic | 1 |
| May, Robert | U.S. House | MA | Republican | 1 |
| May, Wendy | U.S. House | NC | Democratic | 1 |
| Mazen, Nadeem | U.S. House | MA | Democratic | 1 |
| Mazeski, Kelly | U.S. House | IL | Democratic | 1 |
| Mazlo, Christopher Craig | U.S. Senate | NV | NON | 1 |
| Mazo, Eugene D. | U.S. House | NJ | Democratic | 1 |
| Mazur, Steve | U.S. House | KY | Independent | 1 |
| Mazzuchelli, Edward James | U.S. Senate | MA | Independent | 1 |
| McAdams, Ben | U.S. House | UT | Democratic | 1 |
| McAdams, Ryan A. Mr. | U.S. House | VA | Republican | 1 |
| McAllister, Vance Michael | U.S. House | LA | Republican | 1 |
| McAndrew, Ruth | U.S. House | NJ | Republican | 1 |
| McArdle Schulman, Maureen B Mrs | U.S. House | NY | Republican | 1 |
| McArthur, Gabriel Shawn Mr. | U.S. House | CO | Democratic | 1 |
| McArthur, Matt | U.S. House | TX | Republican | 1 |
| McBath, Lucia Kay Ms. | U.S. House | GA | Democratic | 1 |
| McBride, Adam Dr. | President | US | Independent | 1 |
| McBride, Arlester (Mac) | U.S. Senate | AL | Independent | 1 |
| McBride, Austin President | President | US | NPA | 1 |
| McBride, John | U.S. House | CA | Republican | 1 |
| McBride, Len McBride | U.S. Senate | NC | Republican | 1 |
| McBride, Len McBride | U.S. Senate | NC | Republican | 1 |
| McBride, Len McBride | U.S. Senate | NC | Republican | 1 |
| McBride, Mark Struthers | U.S. House | SC | Republican | 1 |
| McBride, Sarah Elizabeth | U.S. House | DE | Democratic | 1 |
| McBride, William | U.S. Senate | FL | Republican | 1 |
| McCaffity, Sean J | U.S. House | TX | Democratic | 1 |
| McCaffree, Mike | U.S. House | MO | Democratic | 1 |
| McCaffrey, Francis Timothy Mr. | U.S. House | TX | Republican | 1 |
| McCaigue, David Mr | U.S. House | GA | Libertarian | 1 |
| McCall, Brian Matthew | U.S. House | TX | Republican | 1 |
| McCallian, Randi McCallian | U.S. House | MO | Democratic | 1 |
| McCallister, Shawna Lyn Miss | President | US | Republican | 1 |
| McCall, Joshua Braxton | U.S. House | GA | Democratic | 1 |
| McCallum, John | U.S. House | GA | Republican | 1 |
| McCamon, Mike | U.S. House | KS | Democratic | 1 |
| McCandless, Reed C. | U.S. Senate | UT | IAP | 1 |
| McCann, John Joseph Mr. Jr. | U.S. House | NJ | Republican | 2 |
| McCarron, Vanessa S | President | US | NON | 1 |
| McCarter, Kyle | U.S. House | IL | Republican | 1 |
| McCarthy, Andrew Kyle | U.S. House | NY | Republican | 1 |
| McCarthy, Christopher | President | US | NON | 1 |
| McCarthy, Daniel | U.S. Senate | AZ | Republican | 1 |
| McCarthy, Kevin | U.S. House | CA | Republican | 3 |
| McCarty, Ryan | President | US | Democratic | 1 |
| McCaskill, Claire | U.S. Senate | MO | Democratic | 4 |
| McCaughrean, John | U.S. House | KS | Republican | 1 |
| McCauley, Gregory Michael | U.S. House | PA | Republican | 1 |
| McCaul, Michael | U.S. House | TX | Republican | 2 |
| McClain, Lisa | U.S. House | MI | Republican | 1 |
| McClanahan, Louis Earl Lll | President | US | Democratic | 1 |
| McClelland, Erin | U.S. House | PA | Democratic | 1 |
| McClellan, Jennifer | U.S. House | VA | Democratic | 1 |
| McClendon, Martin V. | U.S. House | WA | Republican | 1 |
| McClintick, Melissa M | U.S. House | WI | Republican | 1 |
| McClintock, Thomas | U.S. House | CA | Republican | 1 |
| McCloskey, Mark T | U.S. Senate | MO | Republican | 1 |
| McCloy, John | U.S. House | FL | Republican | 1 |
| McClure, Jessica | U.S. House | NE | Democratic | 1 |
| McCollum, Betty | U.S. House | MN | DFL | 1 |