[maryz]

According to exit polls in Wisconsin, a strong 4% were indeed Democrats who crossed over. But they mostly voted for Santorum.

Are you sure they're not Dems who are social conservatives? Until things "settled down" after Roe v. Wade, Democrat pols were more likely to be social conservatives than Republicans were. Lord knows, GOPe still has no use for social conservatives. There are lots of Dems who are socially conservative (I wouldn't hazard a guess as to numbers) who remain Dems -- partly because of historical reasons (like family tradition) and partly because the GOPe doesn't offer an attractive alternative.

[Califelephant]

“...Are you sure they’re not Dems who are social conservatives?...”

Nope, they’re not social conservative Democrats. The exit polling indicated they were Daily Kos Democrats trying to play games in a Republican primary.

[PSYCHO-FREEP]

There are now very few Democrat Social Conservatives left and if they are, they have either quit the party or turned Independent/Tea Party or Republican.

The Democtat Party is now too clearly defined as extreme Liberal, Gay, Socialist, Marxist, Communist. There is absolutely nothing left in that party to support a Social Conservative, like there was during to Reagan years.