Maryland Gov. Martin O’Malley. (AP Photo/Patrick Semansky, File)

Maryland Gov. Martin O’Malley (D), who was on the campaign trail in Iowa over the weekend, is turning his attention back to the Free State on Monday, with plans to attend a rally for his preferred successor on the eve of the Democratic primary.

O’Malley is scheduled to appear alongside Lt. Gov. Anthony G. Brown at the event in Largo on Monday night and has other appearances scheduled on behalf of the Democratic front-runner earlier in the day, according to aides to O’Malley and Brown.

The governor’s activities come amid a frenzied push from Brown and his rivals before polls open Tuesday. In the Democratic primary, Brown faces Attorney General Douglas F. Gansler and Del. Heather R. Mizeur (Montgomery), both of whom have schedules Monday filled with visits to Metro stops, diners, markets and shopping centers.

The four Republican candidates running for governor are also making the rounds Monday. The GOP hopefuls include Harford County Executive David R. Craig, Del. Ronald A. George (Anne Arundel), Anne Arundel businessman Larry Hogan and Charles County businessman Charles Lollar.

O’Malley, who is weighing a 2016 White House bid, completed a two-day swing through Iowa on Saturday with a speech at a Democratic convention in Des Moines and a string of campaign events elsewhere in the state with Jack Hatch, the party’s nominee for governor this fall. The Maryland governor’s travels took him to Cedar Rapids, Iowa City and Dubuque.

Maryland Gov. Martin O'Malley shakes hands with Ben Guise of Des Moines as he meets with Iowa Democratic Party volunteers on Saturday in Des Moines. (Photo by Scott Morgan for The Washington Post)

Back home, O’Malley has been a Brown supporter since the beginning of the campaign. O’Malley appeared at a rally for Brown in Baltimore the day after Brown announced his candidacy in May 2013.

Since then, O’Malley has not been a frequent presence on the gubernatorial campaign trail, but aides say he has helped Brown in a number of ways, including raising money, visiting campaign offices to talk to volunteers and joining groups waving signs for the candidate. O’Malley also appeared with Brown at a major fundraiser last month featuring Bill Clinton.