Blackburn helped draft the Republicans' antigay national platform.
Foxx is known for saying Matthew Shepard's murder was not a hate crime.
Allen has a record of opposing marriage equality and LGBT-inclusive hate-crimes laws.
Pocan succeeds Tammy Baldwin, who tonight was elected to the U.S. Senate.
Akin shocked voters with his comments about 'legitimate rape,' but he also said marriage equality threatens the traditional family.
Massachusetts voters returned a Democrat to the Senate, and at the same time sent home a Republican who had at times sided with LGBT Americans.
The Democrat, Chris Murphy, has won his quest for Connecticut's open seat in the U.S. Senate.