01/14/2008 3:38 PM ET

ANNAPOLIS, Md. (AP)- Another statewide poll shows Governor Martin O'Malley has lost support with voters.

A poll released Monday by Gonzales Research and Marketing Strategies has more voters disapproving than approving of O'Malley's job as governor. That is the first time that has happened since O'Malley took office last year.

According to the telephone poll of 848 registered voters, 49 percent disapproved of O'Malley's performance. Thirty-nine percent approved, and 12 percent had no opinion. That's a 13-point drop from last spring. The poll had a margin of error of plus or minus 3.5 percentage points.

O'Malley's predecessor, Republican Governor Robert Ehrlich, never dipped below 50 percent approval ratings in Gonzales polls.

Only 27 percent of voters told the poll they approved of a special session of the legislature that O'Malley called in November to raise taxes.