It's not irrelevant. The two parties have been instrumental in restricting the rights of same sex couples. Just 2 short years ago on the 8th, these dems voted to reaffirm DOMA.
Reps. Jason Altmire (D-Pa.), John Barrow (D-Ga.), Sanford Bishop (D-Ga.), Dan Boren (D-Okla.), Ben Chandler (D-Ky.), Jerry Costello (D-Ill.), Mark Critz (D-Pa.), Henry Cuellar (D-Texas), Joe Donnelly (D-Ind.), Gene Green (D-Texas), Tim Holden (D-Pa.), Larry Kissell (D-N.C.), Dan Lipinski (D-Ill.), Mike McIntyre (D-N.C.), James Matheson (D-Utah), Collin Peterson (D-Minn.), Nich Rahall (D-W.V.), Mike Ross (D-Ark.) and Heath Shuler (D-N.C.).