Over the weekend, the competitive Democratic race to be Maryland's attorney general had Gov. Martin O'Malley stumping, banjo in hand, for his preferred nominee, Sen. Brian E. Frosh of Montgomery County, at a Baltimore Irish pub. Earlier that day, Del. Jon S. Cardin pitched his own candidacy for attorney general by hosting a get-out-the-vote campaign with his uncle, U.S. Sen. Ben Cardin. Jon Cardin said Monday his uncle would campaign alongside him Tuesday, too.