The right wing religious wackos who have taken over the party. In the year 2012 Abortion, Gay Marriage and contraceptive coverage should not be an issue in an election if you don't believe in them fine, but why should your beliefs be pushed on the country?
I am pro life in my beliefs but am pro choice when it comes to others. I really believe that Romney lost because of the social issues that he was made to convert to because the religious right rules the primary's. Most of the exit polls stated that they thought Romney would do a better job for the economy but he got killed on the social issues. He lost my vote when he went along with the religious right on the social issues which was a complete 180 from his beliefs in mass. As long as the Republicans cater to the religious right of the party they have lost my vote and the votes of a lot of others who believe as I do.

This is an actual quote from one of my friends on facebook who is very religious and votes with her religion.
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I will always vote for the most pro-life candidate, because God hates the shedding of innocent blood (Prov.6:17). I will always vote for the most pro-Israel candidate, because God blesses those who bless Israel and curses those who don't (Gen.12:3). I will always vote for the most pro-debt reduction candidate, because the borrower is servant to the lender (Prov.22:7). I will always vote for the most pro-work candidate because God says if a man does not work, let him not eat (2 Thes. 3:10). I will always vote for the most pro-marriage candidate, because God is for marriage as defined in Genesis 2:24. I will always vote based as close as I can on God's Word (2 Tim.3:16), knowing that whoever gets elected, God is the one who puts all men in authority (Dan. 2:21)."