The Republican candidates for retiring Sen. Olympia Snowe’s (R-Maine) seat will face a series of nine debates between April 5 and the June 12 primary, the Maine Republican Party announced.

The events, being dubbed “candidate forums,” will be scattered around the state. All six Republicans running in the primary have been invited: Maine Secretary of State Charlie Summers, state Attorney General William Schneider, state Treasurer Bruce Poliquin, former state Sen. Rick Bennett, state Sen. Debra Plowman and businessman Scott D’Amboise.

Four Democrats are running in their party’s primary for the open seat. But all eyes are on Angus King, Maine’s former Independent governor, whom polling suggests leads the field of candidates seeking to replace Snowe.