Sen. Mark Herring (D-Loudoun) has started calling supporters to tell them he plans to run for attorney general in 2013, according to several well-placed Democrats, who have knowledge of the call but are not authorized to speak.

Reached by phone Monday, Herring said he has been giving “a lot of consideration” to running, but that he was not ready to make an official announcement. He said supporters have encouraged him to run.

Possible candidates have been lining up since Attorney General Ken Cuccinelli (R) announced in December that he would not run for reelection, but instead would challenge Lt. Gov. Bill Bolling (R) for governor.

Former House Minority Leader Ward Armstrong (D), who lost his seat after Republicans eliminated his largely rural Southside district, has said he is considering running for attorney general.

Late last year, Robert Bell (R-Charlottesville) announced he would run to be the state’s top lawyer. Sen. Mark Obenshain (R-Harrisonburg) said he will explore running.