Maryland Lt. Gov. Anthony Brown, left, is seeking to succeed Gov. Martin O'Malley, center. (Patrick Semansky/AP)

Lt. Gov. Anthony Brown (D), who has been eying a bid for Maryland governor next year, plans to kick off his campaign next month.

An invitation from Brown that has started to circulate asks supporters to save the date of May 10 for a “very special announcement” at Prince George’s Community College in Largo.

Brown, a former delegate from Prince George’s, will be joined at the event by “a host of elected officials, community leaders and citizens from around Maryland,” according to the invitation, a copy of which was obtained by The Washington Post. Supporters are told to “bring the entire family to enjoy food, entertainment and fun!”

As of now, it appears Brown will be the first to make his bid official among a competitive field of Democrats seeking to succeed Gov. Martin O’Malley (D). The primary is in June 2014.

Attorney General Douglas F. Gansler (D), who is sitting on a much larger bank account than other hopefuls, is also widely expected to run. Howard County Executive Ken Ulman (D) and Del. Heather Mizeur (D-Montgomery) are also taking a strong look at the race.

A spokeswoman also confirmed Thursday that U.S. Rep. C.A. Dutch Ruppersberger (D-Md.), a former Baltimore County executive, is also considering the race.

“He’s considering it, but right now he’s very much focused on representing Maryland’s Second District,” said Ruppersberger spokeswoman Jaime Lennon. “He loves the job he has.”

Brown will have the backing of O’Malley, who wrote in an e-mail to supporters last year that “no matter what lies ahead for Anthony in public service, I know that I will be with him 100 percent.”

Republicans looking at the 2014 governor’s race include Harford County Executive David R. Craig (R), Frederick County Commissioner Blaine R. Young (R) and former Ehrlich Cabinet secretary Larry Hogan, who now runs the group Change Maryland.