PORTLAND (WGME) -- Graham Platner has officially submitted the paperwork to withdraw from the U.S. Senate race in Maine.In the letter to the Maine Secretary of State's Office, Platner says he is grateful for his supporters and hopes that the movement he was part of will continue.He signed off by saying, "F--- ICE. Free Palestine. Up the Hearts."Platner has blamed entrenched party politics for forcing him out of the Senate race after sexual assault allegations surfaced against him in a Politico report.According to the report, Jenny Racicot said Platner drunkenly forced her to have sex after she told him to...