A White House job is a career pinnacle, but sometimes it can be too much of a good thing. "Most people last 18 months," says Erskine Bowles, a former chief of staff to President Clinton. "It's the most exhausting, most comprehensive experience in your life." This means President Obama is likely to see some high-profile exits by yearend. Below is a handicapper's guide to departures, based on interviews with top White House officials and their associates.
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