Lt. Gov. Anthony G. Brown. (Photo by Astrid Riecken For The Washington Post)

Maryland Lt. Gov. Anthony G. Brown (D) picked up endorsements of his 2014 gubernatorial bid Wednesday from the newly elected leaders of the county councils in both Montgomery and Prince George’s counties.

The backing of Montgomery’s President Craig Rice and Prince George’s Chairman Mel Franklin added to a long list of fellow Democrats who have sided with Brown in the June primary. Both Rice (D-Upcounty), 41, and Franklin (D-Upper Marlboro), 38, were selected by their colleagues this week to lead their respective councils in Maryland’s two largest jurisdictions.

“Craig Rice and Mel Franklin are dynamic leaders who represent the next generation of Maryland leaders, and I congratulate them for being elected as county council chairs and thank them for their support,” Brown said in a statement.

Brown has dominated the endorsement process in the early stages of his primary race against Attorney General Douglas F. Gansler (D) and Del. Heather R. Mizeur (D-Montgomery).

Brown’s high-profile backers include Gov. Martin O’Malley (D); U.S. Sens. Barbara A. Mikulski (D-Md.) and Benjamin L. Cardin (D-Md.); House Minority Whip Steny H. Hoyer (D-Md.); and both state Senate President Thomas V. Mike Miller Jr. (D-Calvert) and House Speaker Michael E. Busch (D-Anne Arundel).

Gansler has been largely dismissive of Brown’s supporters, arguing that the race will be decided by voters and not by members of the “Democratic establishment.” He has promised to highlight his supporters later in the campaign. Mizeur has rolled out a much smaller number of officials supporting her.

Among local leaders, both Montgomery County Executive Isiah Leggett (D) and Prince George’s County Executive Rushern L. Baker III (D) remain uncommitted.