Should a Christian vote Democratic?

I have been asked the question by numerous students and friends, "Should a Christian vote for and embrace the Democratic party?" The question is asked because if one party embraces the sins of abortion and homosexuality, without a doubt, it is the democratic party. Well......here is an interesting sermon from John MacArthur on this very issue.

http://www.youtube.com/watch?v=h0GqVyYYfHc&feature=youtu.be

I must say, I am surprised this has not been picked up by the media.