A Season of Opportunity for Conservative Democrats?

From what little I know about politics, now seems to me an ideal time for moral conservatives remaining within the Democrat Party to press their social conservative agenda.

1. The recent Democrat legislative victories included the election of putative pro-life Democrats. Social conservatives can argue with a straight face that they have given their party the keys to the kingdom.
2. The Republican Party could possibly be on the self-destructive path toward nominating a pro-abortion candidate. Even though Democrats have no hope of putting forward a legitimate pro-life nominee, if conservatives could nudge the Democrat Party rightward on social issues, they might conceivably woo back into the fold a sizable number of Southern ex-Democrats who have grown frustrated with the GOP.
3. The black and hispanic demographics are palpably pro-life and anti-gay-activism. Without them, Democrats cannot win—even this election cycle. Blacks and hispanics have an opportunity in this election cycle to flex their political muscle and demand concessions from the white, liberal, academic coalition that has dominated Democrat platform determinations since the 1970s. NARAL simply lacks the public support to put anyone into the White House.

What concessions might social conservatives demand from the Democrat Party? A pro-life plank in the party platform is probably an overreach, especially since none of the presidential candidates would support such a move. But they might be able to secure a neutral plank on the platform, similar to that endorsed by Democrats for Life of America. And I think there is a realistic hope that the Democrat platform might be altered to affirm marriage as consisting exclusively of the union of a man and a woman. After all, Howard Dean already misstated the platform in just such language to a group of evangelicals (see here), and even John Kerry has questioned the wisdom of supporting gay marriage in Democrat platforms (see here). I'm a Republican, and I don't see that changing any time soon. But social conservative issues are too important for social conservatives to put all of their eggs into the GOP basket. The nation only benefits if godly people are willing to push for the advancement of social conservative issues in every political party. The question is: Do enough social conservative leaders remain within the Democrat Party to make this kind of change, or did the party succeed in purging nearly all of them in the 1970s, 1980s, and 1990s to prevent any future renaissance of socially conservative Democrats?