Sounds like a big snafu in Md:

On Saturday, I was given a ballot by election officials at the Wheaton early voting site that would have allowed me to vote for John Sarbanes for Congress.  The problem is that I live in Jamie Raskin’s district.  And after I posted the story on Facebook, three friends of mine said that similar things happened to them.  This incident points to a significant flaw in the early voting system that needs to be addressed.