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It's Ehrlich vs. O'Malley

AP has declared former Maryland Gov. Bob Ehrlich the winner tonight of the Republican nomination for governor over Sarah Palin-backed Brian Murphy. It sets up an Ehrlich vs. incumbent Gov. Martin O'Malley showdown.

This may be a blue state, but don't underestimate Republicans' chances here. Just look at the results from Delaware Senate tonight. So far, Christine O'Donnell leads 56%-45% over Mike Castle with 37% of precincts reporting.

Anything can happen, especially if Democrats sit on their hands. And Ehrlich is a much more credible candidate than O'Donnell as Maryland, like many other states, is having to make serious budget cuts. That said, Democrats in Maryland are more engaged voters than in many places. Either way, this is one to watch.