On September 4, the Constitution Party submitted 2,700 signatures to place its nominee, Kevin Thompson, on the November 2007 ballot to fill the vacant Massachusetts 5th district. 2,000 valid signatures are required, so Thompson is likely to qualify. If so, he will be the first minor party candidate on the ballot in Massachusetts for U.S. House since 2002.

The Democratic and Republican Party nominees are being chosen in a special primary on September 4. Although the Green and Working Families Parties are also ballot-qualified, no one is running in their primaries for that office.