State Sen. Gwendolyn T. Britt (D-Prince George's) is under serious consideration to be Douglas M. Duncan's running mate in next year's race for governor, a spokeswoman for the campaign said yesterday.

Spokeswoman Jody Couser said the Montgomery county executive is considering other candidates from Democrat-rich Prince George's County and the Baltimore area, but she declined to name them.

On Friday, campaign aides floated two other names: Baltimore City Council member Keiffer J. Mitchell Jr. and Freeman A. Hrabowski III, president of the University of Maryland Baltimore County.

But in interviews yesterday, Mitchell said he has had no conversations with Duncan or his aides about the post, and Hrabowski said that he has had one conversation with a Duncan aide, weeks ago, and that he told the aide he was not interested.

"I've said consistently that I have no interest in elected office," said Hrabowski, who sent an e-mail to university faculty yesterday underscoring that point.

Duncan is also considering other Baltimore area candidates, said a source close to the campaign.

Britt, a first-term senator and civil rights activist, said yesterday that she has had a few "casual discussions" with Duncan about joining the ticket. But Britt said she was surprised to learn that her name was being floated.

"We have not had the one-on-one discussion one would have to have to bring you to the point where you could say this is or isn't something you would do," said Britt, a Duncan supporter.

The Post reported Saturday that Prince George's Del. Anthony G. Brown (D) has emerged as Baltimore Mayor Martin O'Malley's leading choice for a running mate, a selection that could be announced this month.

A source close to that selection process said O'Malley (D) has considered others, including Rockville Mayor Larry Giammo, Ocean City Mayor Jim Mathias and Montgomery County Council President Tom Perez (Silver Spring.)