Montgomery County, PG, and Baltimore carried the state because they have more people. And if more people vote for one candidate, that candidate wins. (Except in calculating the electoral college representation, that is.)

BTW, (here, in Mont. County) we have plenty of suburbs, but few mcmansions, proportionally speaking. The mcmansions and the more rural parts of the county are where the (minority) Bush votes came from. Montgomery County, as a whole is far too smart to be a "Bush stronghold."