Harford County Executive David R. Craig became the first top-tier Republican candidate for governor to make his candidacy official Tuesday as he filed papers with the State Board of Elections.

Craig signed up to be on the June 24 primary ballot along with his running mate. Del. Jeannie Haddaway of the Middle Shore.

Republican candidates who have announced but not filed are Del. Ron George of Anne Arundel County and Charles County business executive Charles Lollar, neither of whom has named a running mate. Larry Hogan, founder of the conservative advocacy group Change Maryland, is also expected to enter the race.

Brian Vaeth, a lesser-known candidate, has also filed on the GOP side.

Among the leading Democratic candidates for governor,  Lt. Gov. Anthony G. Brown and Del. Heather R. Mizeur have filed along with their running mates, Howard County Executive Ken Ulman and The Rev. Delman Coates. Announced candidate Attorney General Douglas F. Gansler and his running mate, Del. Jolene Ivey of Prince George's County have yet to filed but have until Feb. 25 to do so.

Two lesser-known Democrats, Ralph Jaffee and Charles U. Smith of Baltimore, have previously filed to run for governor.