Fiscal Cliff, Because GOP Fears Tea Party Primaries

From Huffington Post:

...Most normal Americans will have very little patience with Republicans as they begin to realize that GOP Members of Congress are willing to risk throwing the country back into a recession because they are worried about being beaten in low turn out primaries by people who do a better job than they do appealing to the extreme right fringe of the American electorate - and to the far Right plutocrats that are all too willing to stoke right wing passion and anger. 

Nate Silver, of the New York Time's 538.com, argues in a recent column that one of the reasons for this phenomenon is the increasing polarization of the American electorate. That polarization translates in to fewer truly "swing" Congressional seats and an increasing number where Members are more concerned with primary challenges than they are with losing in a general election. He concludes that at this moment the number of solidly Republican seats is larger the number of solidly Democratic seats. 

This, he argues is partially a result of redistricting by Republican legislatures that packed Democrats into a limited number of districts in many states. But he also contends it results from increasing polarization of the electorate in general. And it is due to the fact that solidly Democratic urban areas have very high concentrations of Democrats, where Republican performing areas tend to have relatively lower concentrations of Republicans. These reasons help explain why, even though Democrats got more votes in House races this cycle than Republicans, Republicans still have more seats in the House...