(CNN) -- Mitt Romney won all three of Tuesday's Republican presidential primaries, putting more distance between himself and his closest contender, Rick Santorum, who indicated he plans to fight on to his home state of Pennsylvania and beyond. Romney's wins in Wisconsin, Maryland and the District of Columbia put him past the halfway mark to the 1,144 delegates needed to clinch the nomination and add to a wide delegate lead that he holds over the other major GOP presidential candidates, according to CNN estimates. Yet Santorum indicated Tuesday night he would compete in the April 24 primaries in five states, including Pennsylvania, where his campaign hopes a win would be a gateway to a run of May primaries in states where he can capitalize on higher percentages of conservative voters.
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NEW: Santorum says he'll continue fight in home state, Pennsylvania, on April 24
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Romney: "We won a great victory tonight "
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Romney more than halfway to 1,144 delegates he needs for nomination, CNN estimates
Pre-primary polls appeared to show Wisconsin's contest was the only one Tuesday that @placeholder had a chance to win.