(The Center Square) — Top Maine Democrats are being groomed as replacements for disgraced U.S. Senate candidate Graham Platner, who has yet to abandon his floundering candidacy amid damaging sexual assault claims.

Former Maine Senate President Troy Jackson, who placed fifth in the recent Democratic gubernatorial race, filed paperwork late Tuesday with the Secretary of State's elections office to challenge incumbent Republican Sen. Susan Collins for the Senate seat, if Platner drops out of the race. 

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