The front-runner beat rival Rick Santorum, the former U.S. senator from Pennsylvania, and two other rivals still in the race, former House Speaker Newt Gingrich of Georgia and Rep. Ron Paul of Texas. Romney, Gingrich and Paul all had made campaign visits to Maryland, while Santorum focused his efforts on the Wisconsin primary, also held on Tuesday.

There was little drama in the outcome. Maryland is a deep blue state, where only 27 percent of voters are registered as Republicans and where President Obama won by double digits in 2008. Maryland Republicans tend to be moderate, well-educated voters, exactly the types who have been attracted to Romney’s tempered, business-centric message throughout the GOP primary.