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The list of Democratic senators who have not come out in support of marriage equality is down to eight. Wonder if they’re getting lonely, or at least a bit nervous. It will be really embarrassing if, as some Republicans are predicting, the 2016 WH GOP nominee supports marriage equality, and you’re a Democratic senator who doesn’t.

Sen. Bob Casey today told Morning Call that he’s joined the large majority of his Democratic Senate colleagues in their support. Casey says he’ll sign on as a co-sponsor to repeal DOMA.

In an interview, the Pennsylvania Democrat said he had decided over time that the Defense of Marriage Act ““ the federal law that defines marriage as one man and one woman ““ should be repealed, and determined that such a belief could not be separate from the overall question of gay marriage.

“˜I ultimately decided that to make a decision about DOMA was making a decision about marriage equality itself,’ Casey said. Casey gave interviews to The Morning Call and the Philadelphia Gay News.

Of the 53 Democratic Senators, the eight un-evolved are: Mark Pryor (AR), Bill Nelson (FL), Tom Carper (DE), Tim Johnson (SD), Joe Manchin (WV), Mary Landrieu (LA), Heidi Heitkamp (ND) and Joe Donnelly (IN).

According to Zack Ford at Think Progress, in the interview, Casey cited the stories he heard and read from LGBTs, families and allies as a significant factor in his decision.

As a senator and as a citizen, I can no longer in good conscience take a position that denies [same-sex families] the full measure of equality and respect.

As Jeremy Hooper at Good As You put it:

So now the race is on: Who will be next? Or, perhaps more importantly: Who will be last?

(Sen. Bob Casey via