The issues that Piper raises have been discussed on Justin Taylor's blog in detail, here are my thoughts for what they're worth:
1) We should be excited, very excited that an African American is running for President. Very excited. i hadn't really grasped this until i moved to the USA, but having a black President might revolutionise particularly small town American race relations. Even here in small, middle class, prosperous water front home owning hundred thousand dollar boat building Washington, North Carolina there are some streets that white people just do not go. And it's awful. So to have an African American candidate, barely a generation on from Brown vs the Board of Education, is worth getting 'giddy' about.
2) But goodness me isn't it complicated? Obama is probably the most ardent protector of abortion in the Senate. He's voted three times against giving financial aid to the survivors of partial birth abortions. Whereas the McCain/Palin ticket gives us the best window of opportunity for overturning Roe vs Wade, possibly for a long time. If Obama wins, and the Democrats get 60 seats in the Senate, that will seem a long, long, long way away.
3) Palin is a woman. Is it Biblical that she should stay at home and look after her family? Yes...maybe. Is it Biblical that we shouldn't have a female Commander in Chief? Yes...maybe. But if Obama wins then Nancy Peloisi is only one step further away.
4) McCain is not a very good candidate. his ad campaign has stepped up in the last week, but he's not convincing. At all. His one massive advantage, aside from being pro-life, is that he won't seem like such an easy target to Russia, North Korea, Iran and Al-Queda. Oh, and he's actually lead and done things in the political sphere, which is more than can be said for Obama.
5) I wish, wish Piper had said that for him Obama's stance on abortion is the tipping point. Because it has to be doesn't it? If i was voting on Tuesday, it would be for McCain/Palin, probably because of this single issue, but with prayers in my heart that Obama has opened the door for the first African American president of the United States.