Former Gov. Robert L. Ehrlich Jr. on Saturday urged Marylanders to join a conservative, free-market group in protesting what the organization calls " Gov. Martin O'Malley's fiscal mismanagement" during a march Wednesday in Annapolis, the opening day of this year's General Assembly session. Ehrlich, who is considering another run for governor, used the Saturday morning WBAL radio program he hosts with his wife, Kendel, to promote the march, which is sponsored by the Maryland chapter of Americans for Prosperity. Ehrlich said he hoped to see a minimum of "a couple of thousand" people descending on the state capital, according to a Washington Post politics blogIn an e-mailed statement, O'Malley's campaign manager, Tom Russell, said the governor has reduced state spending by more than $4 billion since taking office. Russell said Ehrlich "ignored spending affordability guidelines and increased state spending by over 20 percent during his last two years in office."