I'm legally (gay) married in Massachusetts, but I live in Maryland. Can I file my taxes as a married person?

I’ve been happily married since July 2010, when my spouse and I legally tied the knot out of state in Massachusetts.

I know that I have to file as a single person for my federal taxes, but I’m not sure how to file my Maryland taxes.
Something tells me that Turbo tax won’t have an answer to this question, so I’m hoping the collective can help me out.

If there is a shortage of HRC tax lawyers on fluther, where can I go to find out Maryland’s policy on same sex marriage?