Adding to our round-up of state-by-state general election match-ups today is Iowa where Rasmussen Reports says, based on a March 31 survey, that Barack Obama is leading John McCain 46 percent to 42 percent, but that McCain trounces Hillary Clinton by 51 percent to 36 percent. The margin of error is 4.5 percent. A key factor in these results are the loyalties of unaffiliated voters who favor Obama over McCain by 46 percent to 37 percent, but who prefer McCain over Clinton by 2-to-1. A SurveyUSA poll conducted in mid-March had McCain leading Clinton 48 percent to 44 percent and Obama leading McCain 50 percent to 44 percent, with a 4.4 percent margin of error.

Read past the jump to see polls from other states we’ve gathered: