A new poll puts Republican gubernatorial hopeful Robert L. Ehrlich Jr. just three percentage points behind his Democratic contender, Maryland Gov. Martin O’Malley — reflecting a tightening of the race since February.

O’Malley earned 47 percent of voter support and Ehrlich earned 44 percent in the most recent telephone survey of “likely” voters by Rasmussen Reports. Two percent of voters preferred other candidates, and 7 percent were undecided.