shot them one by one. we are taking you live to oakland for the latest in just about ten minutes. voters are heading to the polls today in three contests. wisconsin, maryland and the district of columbia are holding republican primaries. mitt romney predicted a win in wisconsin and holds a big lead in maryland polls. wisconsin will be a key swing state in november. it s one of the few winner-take-all stakes in the republican race. rick santorum seems to be looking beyond today s contests. he says may will be his big month for delegates. the world wants clarity in the trayvon martin case. now there is a little bit more. it s in the form of higher resolution video of george zimmerman s arrival at the sanford, florida, police department the night he killed trayvon martin. as you know, the neighborhood watch volunteer claims he fired in self-defense after trayvon hit him in the nose and banged his head against the sidewalk. the clearer footage does appear to show some mark or