Norman Podhoretz in The Wall Street Journal here:
To be sure, no white candidate who had close associations with an outspoken hater of America like Jeremiah Wright and an unrepentant terrorist like Bill Ayers would have lasted a single day. But because Mr. Obama was black, and therefore entitled in the eyes of liberaldom to have hung out with protesters against various American injustices, even if they were a bit extreme, he was given a pass.