It almost sounds to me as if you are saying "Even if we lose all the other arguments, and Obama is the better choice on every other ground except abortion, you as a Christian are obligated to vote against Obama for that reason alone."
But even the actual Obama quotes don't seem to me to say that he wants these "abortuses" to die. He may have been misinformed about whether born-alive fetuses would be left to die. He also has made statements to the effect that "health of the mother" exceptions on late-term abortions should be made clear so that they don't cover just anything.
What are you suggesting, that Obama just likes seeing women get abortions?
And isn't it illegal to let babies die, anyway?
My arguments have been this.
1) Roe v. Wade will almost certainly not be overturned regardless of who is elected President.
2) Even if it is overturned, it will not result in many babies being saved through legal restrictions. I would be surprised if any state, even the reddest of the red states, would pass a comprehensive ban on abortion.
3) Abortion rates rose until the Clinton administration, after which they have steadily decreased. There may be many reasons for that, but one of the has to be the passage of the Familay and Medical Leave Act, which made it illegal for employers to fire employees who took unpaid time off to bear children. Health care reform would be another way in which abortion might be discouraged.
4) I don't see an overwhelming case for the simon-pure pro-life position. I can see both sides of the issue, and some of my moral intuitions suggest that you can't give the same right to life to something that is not conscious that you do to something that is. I'm not coming out as a staunch defender of "a woman's right to choose" and would like to see more restrictive laws on abortion than are presently allowed under Roe.
4) While abortion is an issue that generates a lot of moral passion, other issues, such as slavery, poverty, corporate responsibility, misguided wars, torture, and global warming (or climate change if you prefer that expression) are also moral issues of considerable importance, and they are issues where the President's action have a much greater and more direct effect than in the area of abortion.
So no, I reject the case for a one-issue abortion-based vote. I have made these points a number of times here. If you think this makes me "every baby-butcher's best friend," you should reflect on how many babies have been saved from abortion as a result of 8 years of Reagan, 4 years of Bush I, and 8 years of Bush II. This is a matter that was settled by the one branch of government deliberately set furthest away from the political arena, the judiciary. I'm also convinced that we have not exercised enough leadership in looking for ways to decrease abortion apart from the long arm of the criminal law.