Democratic voters are turning out for this year’s primaries at levels not seen in more than 20 years. Michigan and Wisconsin saw midterm records, and large numbers of voters have turned out in Minnesota, Texas and Georgia. Competitive primary races have played a major role in the enthusiasm. Voter turnout in primary elections is an imperfect predictor of general election results, especially when one party has the more compelling early contests. Republicans say they're responding with a major effort to turn out their voters in the fall. The numbers nevertheless offer Democrats an encouraging sign after being shut out of power in Washington two years ago.