A puzzle on US politics
One of the striking features of US politics over the past fifteen years is the rise of partisan feeling. The blogosphere reflects this, and has helped to accelerate it. Whereas US political discussion used to be dominated by appeals to bipartisanship there now seems to be more party-specific rancour than, for example, in Australia.
On the other hand, there’s a lot of commentary about the absence of competitive races and the increasing advantage of incumbency.
These two trends seem inconsistent to me. Of course, with strong partisan loyalties you expect a fair number of safe seats for either party, but the discussion of incumbency is mostly about the strength of individual incumbents. And even with many safe seats, there ought also to be a large number of marginals.
Has anyone attempted to reconcile these conflicting trends?