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I agree with Mr. Madden that it's difficult to find Democrats qualified to work in the White House who didn't work in the Clinton Administration. I don't believe, however, that Obama has much cause for concern from the left if he continues to appoint them. It's not as if he's likely to face a serious primary challenge next election season, as long as he does a good job. And as long as he keeps appointing centrists, Republicans can't keep claiming that he's an extremist.
On the other hand, his statement that he'd appoint a "team of rivals" in the style of Lincoln so far holds no water. Nearly every appointee had endorsed him in the primaries, the most notable exception being Hillary Clinton. The names of Republicans who are being floated for positions is also dominated by those few who endorsed him this last season. Where are his so-called rivals?