As ever, the great atheist Christopher Hitchens nails it over at Slate:

As Barack Obama is gradually learning, his job is to be the president of all Americans at all times. If he likes, he can oppose the idea of marriage for Americans who are homosexual. That’s a policy question on which people may and will disagree. However, the man he has chosen to deliver his inaugural invocation is a relentless clerical businessman who raises money on the proposition that certain Americans—non-Christians, the wrong kind of Christians, homosexuals, nonbelievers—are of less worth and littler virtue than his own lovely flock of redeemed and salvaged and paid-up donors.

This quite simply cannot stand. Is it possible that Obama did not know the ideological background of his latest pastor? The thought seems plausible when one recalls the way in which he tolerated the odious Jeremiah Wright. Or is it possible that he does know the background of racism and superstition and sectarianism but thinks (as with Wright) that it might be politically useful in attracting a certain constituency? Either of these choices is pretty awful to contemplate.