Primary elections: Seven states to watch

3. Maryland

Liam Farrell/The Capital/AP
Maryland Republican candidate for governor Bob Ehrlich votes with his son Drew during early voting Thursday, Sept. 9, in Annapolis.

In the Maryland governor's race, former Republican Gov. Bob Ehrlich faces a primary challenge from Brian Murphy, a business investor who was virtually unknown before winning Sarah Palin's endorsement last month.

But former presidential candidate Sen. John McCain (R) of Arizona says Ehrlich has his support in Maryland's Republican primary for governor.

Democratic Gov. Martin O'Malley, who ousted Ehrlich from office in 2006, faces minor opposition for the nomination to compete for a new term.

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