Jim Messina, founder and CEO of The Messina Group and manager of the Obama 2012 re-election campaign, says Graham Platner's "career in politics is done" after months of turmoil surrounding his campaign and sexual assault allegations that Platner has denied. Messina says Platner should not get to decide Maine Democrats' nominee, arguing voters and the party need an open, transparent process to choose a replacement in a race he says Democrats likely need to win to flip the Senate. He speaks with Kailey Leinz and Joe Mathieu on the late edition of Bloomberg's "Balance of Power." (Source: Bloomberg)