The tumultuous primary season will come to a close on Tuesday with the potential for still more shocks to the political establishment. The question is what the upheaval of the primaries says about the prospects for November.

The story line of Election 2010 has seemed to change week by week. Candidates, consultants, pollsters - and political reporters - have described it at one time or another as a year of anti-incumbency, or anti-establishment, or anti-Obama. The power of the "tea party" has been measured (and mismeasured) and measured again. Republicans have been described as both resurgent and at war with themselves; Democrats as embattled and endangered, or outright doomed.

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