Maryland, Washington, D.C., and Wisconsin all went for Mitt on Tuesday night, making Rick Santorum look even more like a party crasher.
Santorum hasn’t beaten Romney outside the South since the Kansas caucus on March 10, although his home state of Pennsylvania votes on April 24. Delaware, Connecticut, New York and Rhode Island also hold contests that day.
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Senior Republicans will now likely increase their calls for the party to rally behind Romney, despite deep reservations among many conservatives about whether he is one of them.
The defeats for the conservative Santorum ramps up pressure on him to pull out of his increasingly bitter standoff with the former Massachusetts governor Romney.