Via Fox News:
The same problem that was reported with some voting machines in Cook County, Illinois has turned up in Maryland. Machines switching Republican votes to Democrat votes have been reported in the city of Frederick and the counties of Queen Anne and Anne Arundel. Will these switches likewise be attributed to a "calibration issue"?
Neither of Maryland's two Senators, Democrats Ben Cardin and Barbara Mikulski, are up for reelection in 2014, but this year's ballot includes the vote for Governor. In Maryland, the governor is elected every four years, which is offset from the presidential election by two years, thus coinciding with the "midterm" elections.
Read the story at Watchdog(dot)org.
UPDATE: There's more on this story from CBS Baltimore.