Romney wins Wisconsin GOP primary, CBS News projects Updated at 10:13 p.m. (CBS News) Republican presidential candidate Mitt Romney will score a high-profile victory Tuesday night in the politically-charged state of Wisconsin, CBS News projects. Romney is also the projected winner in the Maryland and District of Columbia primaries. At this point in the race, the former Massachusetts governor has secured more than half the delegates needed to win the GOP nomination outright and the increased momentum that could help him eclipse his main GOP rival, Rick Santorum. With 539 of 3,755 precincts reporting in Wisconsin, Romney has 43 percent of the vote, Santorum has 38 percent of the vote, Ron Paul has 11 percent, and Newt Gingrich has 6 percent. In Maryland, with 471 of 1,892 precincts reporting, Romney is winning 48 percent of the vote, while Rick Santorum is carrying 30 percent. In Washington, with 40 of 143 precincts reporting, Romney has 69 percent of the vote, Paul has 13 percent and Gingrich has 11 percent. Santorum failed to get on the ballot in Washington. The primary in Wisconsin was the main event Tuesday, giving one candidate the opportunity to win in a large, politically active state that's sure to be competitive in the general election. Wisconsin primary results Maryland primary results Washington, D.C. primary results CBS News exit poll: Reservations about Romney dim in Wisconsin Wisconsin's recent political environment has been intense: The state saw a string of Tea Party victories in the 2010 election, politically divisive recalls last summer, and will hold a recall vote on Republican Gov. Scott Walker this summer. Romney is aiming to deliver a final blow to his main rival Rick Santorum's campaign in Wisconsin, while Santorum is striving to expand his voter base and perform well ahead of the April 24 primary in his home state of Pennsylvania. CBS News exit polling out of Wisconsin shows Romney winning across voting blocs: He is winning among those who describe themselves as "very conservative," as well as conservatives overall. Romney is winning among college graduates and those without a college degree, as well as among those making more than $50,000 and less than $50,000. He also has the most votes from both men and women. Romney is winning among voters who say they support the Tea Party movement, though Santorum has the most support so far from Wisconsin voters who say they oppose the movement. Santorum has also bested Romney among evangelical voters so far. Romney to win Maryland GOP primary, CBS News projects Full Republican delegate scorecard Nationwide primary results so far CBSNews.com's complete 2012 campaign coverage Exit polling also revealed that Romney supporters in Wisconsin more "strongly supported" the former governor than his backers in previous primaries, such as Illinois. As voters appear to become more comfortable with Romney, the GOP establishment is coalescing around his candidacy as well. For his part, Romney on Tuesday night appeared ready to move into the general election, focusing his attacks on President Obama rather than his Republican rivals. "A lot of Americans have given up on the President but they haven't thought about giving up," he said in Milwaukee, Wisconsin. Not on themselves. Not on each other. And not on America. With his projected victories Tuesday night, CBS News now estimates Romney has at least 627 delegates -- more than half of the 1,144 delegates needed to win the GOP nomination outright. There are a total of 92 delegates at stake Tuesday, with 39 coming from Wisconsin, 37 from Maryland, and 16 from Washington. The Maryland and D.C. primaries were closed to Republicans while Wisconsin held an open primary.