| Max Miller Victory | N | GA |
| Max Rice Committee | H | IL |
| Max Richardson for US Senate | S | PA |
| Max Rose for Congress | H | NY |
| Max Rose for Congress | H | NY |
| Max'S Back PAC | O | MA |
| Max Steiner for Congress | H | DC |
| Max Ukropina for Congress 2024 | H | CA |
| Maxvote | O | CA |
| Maxwell 4 America | I | TN |
| Maxwell Alejandro Frost for Congress | H | FL |
| Maxwell for Nc | H | NC |
| Maya for Georgia | S | GA |
| Maya R. Cummings for Congress | H | MD |
| Maycumber for Congress | H | WA |
| Mayday PAC | O | DC |
| Mayer Electric Supply Company INC Political Action Committee, the (Mayer Electric Pac) | Q | AL |
| Mayflower-Plymouth | N | VA |
| Mayflower-Plymouth Capital LLC | I | VA |
| May for Congress | H | TX |
| May for Congress 2024 | H | CA |
| Mayhugh for Va | H | VA |
| May Lor Xiong for Congress | H | MN |
| May Lor Xiong for Congress | H | MN |
| Maynard Cooper & Gale PC PAC | Q | AL |
| Mayock for Congress | H | MA |
| Mayock for Congress | H | MA |
| Mayock for Senate | S | MA |
| Mayo PAC | H | FL |
| Mayor Bill Wells for Congress | H | CA |
| Mayors PAC | N | FL |
| Mayra Flores for Congress | H | TX |
| Mazi for Congress | H | VA |
| Mazi Victory Fund | N | VA |
| Mazo for Congress | H | NJ |
| Mazur for Congress | H | KY |
| Mbda Incorporated Political Action Committee | N | VA |
| Mb Financial INC Political Action Committee | N | IL |
| Mb PAC | N | WA |
| McAfee Acquisitions Corp. Political Action Committee (A/K/A McAfee Pac) | N | CA |
| McA Victory Fund | N | DC |
| McBride for Delaware INC. | H | DE |
| McBride for President | P | AL |
| McBride for Senate | S | NC |
| McBride Victory Fund 2024 | N | DC |
| McCaffity for Congress | H | TX |
| McCaigue for Congress | H | GA |
| McCarthy Valadao Victory Fund | H | MD |
| McCarthy Victory Fund | N | MD |
| McCaskill Senate Fund | N | MO |
| McCaskill Senate Victory 2018 | N | DC |
| McCaskill Sinema Victory Fund | N | DC |
| McCaskill Victory Fund | N | MO |
| McCaul for Congress, INC | H | TX |
| McCaul Victory Fund | N | TX |
| McClellan Cotter Smasal Victory Fund | H | DC |
| McClellan for Congress | H | VA |
| McClellan Victory Fund | N | VA |
| McClintock for Congress | H | CA |
| McClintock Jfc | N | CA |
| McClintock Schweikert Jfc | N | CA |
| McClintock Schweikert Jfc II | N | CA |
| McCollum for Congress | H | MN |
| McColumn for Leadership | S | GA |
| McConkey for Congress | H | NC |
| McConnell for Majority Leader Committee | N | VA |
| McConnell Gardner Victory Committee | N | VA |
| McConnell Senate Committee | S | KY |
| McConnell Victory Committee | N | VA |
| McCorkle for Colorado | H | CO |
| McCormick for Congress | H | CO |
| McCormick for Congress | H | IN |
| McCormick for Ga-06 | H | MD |
| McCormick Victory Fund | N | WI |
| McCotter 2012 | P | MI |
| McCrackin for Congress | H | CO |
| McCready for Congress | H | MT |
| McCready Victory Fund | N | MT |
| McCutcheon for Freedom | P | AL |
| McDade for Congress 2024 | H | VA |
| McDermott for Congress | H | IN |
| McDermott Victory Fund | N | IN |
| McDermott Will & Emery LLP PAC | Q | DC |
| McDonald for New Mexico | H | NM |
| McDonald Hopkins LLC PAC | Q | OH |
| McDonalds Corporation Political Action Committee | Q | IL |
| McDowell for Congress | H | NC |
| McEachin for Congress | H | VA |
| McFall for Congress | H | NM |
| McFarlane for Congress | H | NH |
| McFarlin for Congress | H | VA |
| McGannon4congress | H | CO |
| McGarvey Victory Fund | N | KY |
| McGinn for New Mexico | H | NM |
| McGinty for Congress | H | PA |
| McGlinchey Stafford Political Action Committee (Macpac) | Q | LA |
| McGonigal for Congress | H | IL |
| McGovern for Florida | H | FL |
| McGrathfor35 | H | VA |
| McGrath Off the Sidelines 2020 | N | MA |
| McGuigan for Pennsylvania | S | PA |
| McGuire for Arizona | S | AZ |
| McGuire for Senate | S | GA |
| McGuire for Virginia | H | VA |
| McGuire for Virginia | H | VA |
| McGuire Recount Committee | H | VA |
| McGuire Victory Fund | N | VA |
| McGuirewoods Federal PAC | Q | VA |
| McHenry-Curbelo Leadership Fund | N | VA |
| McHenry for Congress | H | NC |
| McIntyrejones PAC | N | NY |
| McKay for Senate INC | S | RI |
| McKayla Wilkes for Congress | H | MD |
| McKayla Wilkes for Congress | H | MD |
| McKayla Wilkes for Congress 2024 | H | MD |
| McKee Election Committee | H | UT |
| McKennon 2020 | S | TX |
| McKenzie River PAC | N | OR |
| McKesson Corporation Employees Political Fund | Q | DC |
| McKim for Congress | H | NC |
| McKinley for Congress | H | WV |
| McKinney for Kansas | H | KS |
| McKinney Tea Party | N | TX |
| McLane Company, INC. Federal Political Action Committee | Q | TX |
| McLean, Ted | I | CA |
| McLendon for Congress | H | TX |
| McLeod for Senate | S | TN |
| McLeod-Skinner for Oregon | H | OR |
| McManus for Congress 2020 | H | NY |
| McMillan in 20 | P | NY |
| McMinn County Democratic Party | X | TN |
| McMorris Rodgers American Dream Project; the | N | VA |
| McMorris Rodgers Smiley Winning Washington 2022 Committee | N | VA |
| McMorris Rodgers Win the Future Fund | N | VA |
| McMullen for Senate Committee INC | S | VT |
| McMullin for President Committee INC. | P | FL |
| McMullin for Utah | S | UT |
| McMurtry for Congress | H | KY |
| McNeely for Congress INC | H | IL |
| McNeil Committee | P | MO |
| McNeill for Utah | H | UT |
| McNerney for Congress | H | CA |
| McQueen for Congress | H | TX |
| McQueen for Texas | S | TX |
| McSally for Congress | H | AZ |
| McSally for Senate INC | S | AZ |
| McSally Senate Victory Fund | N | GA |
| McSally Senate Victory Fund 2020 | N | GA |
| McSally Victory Committe | N | VA |
| McTp PAC | N | TX |
| McTx Victory Committee | N | TX |
| MD-06 Republican Nominee Fund 2024 | N | MD |
| MD It Federal PAC | N | MD |
| MD Senate Republican Nominee Fund 2022 | N | VA |
| MD Senate Republican Nominee Fund 2024 | N | VA |
| Mdu Resources Group Good Government Fund | Q | ND |
| Me-02 Republican Nominee Fund 2022 | N | VA |
| Meader for Congress | H | NC |
| Meadows Freedom Fund | N | NC |
| Meagan Hanson for Congress, INC. | H | GA |
| Meaningful Action Towards Tomorrow PAC | N | CA |
| Measured Politics | V | PA |
| Meca Victory Fund | H | DC |
| Mechanical Contractors Association of America Political Action Committee (McA-Pac) | Q | MD |
| Mechanical Equipment Company INC Political Action Committee | N | LA |
| Mechanical & Service Contractors Association of Eastern Pa McA/Sca PAC | N | PA |
| Mechanical Technology INC Political Action Committee | N | NY |
| Mediacom Communications Corporation Political Action Committee | Q | NY |
| Median Ways PAC | N | PA |
| Medicaid Health Plans of America Political Action Committee | N | DC |
| Medical Cannabis Research PAC | N | PA |
| Medical Device Innovation PAC, A Political Action Committee of Icu Medical, INC. | Q | DC |
| Medical Device Manufacturers Association PAC | Q | DC |
| Medical Marijuana Association of Georgia PAC | N | GA |
| Medical Marijuana Association PAC | N | GA |
| Medical Marijuana PAC | N | GA |
| Medical Professional Liability Association Political Action Committee (Mpl Pac) | Q | MD |
| Medicare for All | Q | WA |
| Medicare for All Delegates Network | N | NV |
| Mednax, INC. Federal Political Action Committee | Q | FL |
| Medtronic INC. PAC | Q | DC |
| Meeca Victory Fund | H | DC |
| Meehan for Pa | H | PA |
| Meeks for Congress | H | NY |
| Meeks Milojevich Global Child Support and Prosperity Group | H | CA |
| Meeks Victory Fund | N | NY |
| Meeks Victory Fund 2024 | N | DC |
| Meet in the Middle for America | O | MA |
| Megan Barry for Congress | H | TN |
| Megaphone | O | TX |
| Mega Red PAC | O | FL |
| Meg for Congress | H | TN |
| Meghanjensenforwy | H | WY |
| Meghann Hovey for Congress | H | FL |
| Meghan Pratschler for House of Representatives | H | CO |
| Meidastouch | N | CA |
| Meidastouch | O | MI |
| Meijer for Senate, INC. | S | MI |
| Meissner 2020 | S | NJ |
| Meitheal Pharmaceuticals INC. Political Action Committee | N | IL |