Nyhan digs into the numbers:
[I]t's clear that the favorable electoral environment has attracted a strong group of Republican candidates. Despite the influence of the Tea Party movement, the GOP actually has more House candidates who have previously held elected office running for open seats than the Democrats do...
If this is surprising, a lot of that has to do with 1) a weird occasional media focus on noncompetitive races and 2) the ability of some smart politicians to brand themselves as "Tea Party" candidates.
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