I'm not sure we actively hitched our horse to that wagon. I think it was more just evolution. We favor those who favor the 2A. Most of those just happen to be conservatives.
That said, I'll tell you the real problem with many "pro 2A" Dems: when push comes to shove, they support the party, and the party is largely anti. Perfect example: in Ohio when Ted Strickland was running for gov, he was given an A+ rating. To my recollection, he didn't proffer any new 2A restrictions. BUT, when the time came to dress presidential candidate John Kerry in brand new camo, put into his hands a shotgun that he probably didn't even know how to operate, and march him into a duck marsh, it was Ted Strickland who was instrumental in the charade. And we know that Kerry is as anti as one can get.
I used to say voting a straight ticket was dumb. After that, I'm not so sure.