I've several acquaintances, close friends and family who consider Obama to be the right choice. Their agreement with his economic and foreign/domestic stances are considered seriously. I can appreciate that and do not care to argue those well-thought out positions. 
However, for those that profess to be Christian, I felt it necessary to post a link to Justin's Taylor's blog on why "Voting for the Most Extreme Pro-Abortion Political Candidate in American History Is Not the Way to Save Unborn Babies." This is not a political matter in my mind, it is a matter of moral conviction.
I'll be to the point. To vote for Obama is to condone murder. Let me say it clearly, IF YOU VOTE FOR OBAMA, YOU ARE CONDONING THE MURDER OF HUMAN BEINGS!
I'd also like to respond to one of Taylor's readers who says, "Of course it isn't. But if you don't tie yourself mindlessly to a single issue, there are plenty of other reasons to vote for Obama." To not consider this single issue as paramount would be to mindlessly (or rather deliberately) ignore God's will against murder (Ex 20:13). It would be to place your hope for prosperity, peace, better fiscal policy and foreign/domestic affairs, etc., above and against the very will of God. Consider it, pray about it, act on it.