BANGOR – At least three Republican candidates for a U.S. Senate seat in Maine have signed up to attend a candidates’ forum this week and a representative for a fourth will also attend.

Tuesday’s forum is sponsored by the Christian Civic League of Maine, Concerned Women for America, and Maine Right to Life.

The league said last week that state Treasurer Bruce Poliquin, state Sen. Debra Plowman and Secretary of State Charlie Summers agreed to attend, and a representative for Scott D’Amboise also confirmed a place.

The race for Republican Sen. Olympia Snowe’s seat also includes two other Republicans, four Democrats and one independent.