How many Republican voters are here in the District?  Romney wins GOP primaries in Maryland, D.C. By Michael O'Brien, msnbc.comFollow @mpoindc  With the general election matchup against President Obama beginning to take shape, Mitt Romney won the Republican primaries in Maryland and Washington, D.C. on Tuesday.NBC News projected Romney would win the D.C. and Maryland primaries – the latter of which by a significant margin over his main rival, Rick Santorum.Justin Sullivan / Getty ImagesRepublican presidential candidate Mitt Romney attends a town hall style meeting April 2 in Milwaukee, Wis.The former Massachusetts governor had looked to move closer to putting the drawn-out Republican primary behind him, and beginning a new chapter – the general election campaign versus Obama.Polls were set to close at 9 p.m. ET in Wisconsin, the top prize in Tuesday’s slate of contests. Romney had battled fiercely in the state against Santorum, who needed a win there to keep his … [Read more...]