Mitt Romney has won the Maryland primary.

The GOP presidential front-runner beat chief Republican rival Rick Santorum in Tuesday's contest. Romney also was looking for victories in Washington, D.C., and Wisconsin. Both states also voted Tuesday.

The former Massachusetts governor is heavily favored to clinch the GOP nomination by June. Santorum has vowed not to abandon his bid despite a string of losses. Newt Gingrich and Ron Paul also remain in the race. Neither is a threat to Romney.

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