The president will hold a fundraiser and campaign-style rally in Nashville to boost GOP Rep. Marsha Blackburn and attempt to knock down Democratic former Gov. Phil Bredesen. They are vying for the Senate seat currently held by Republican Sen. Bob Corker, who declined to run for a third term.
Making things more complicated, Corker hasn't given a full-throated endorsement to Blackburn, and he has said he considers himself a friend of Bredesen's.
Polls have shown a close contest between Blackburn, a longtime member of Congress who has run as a staunch Trump supporter, and Bredesen, a two-term governor who last won a statewide election in 2006. Bredesen hopes to win a seat in a state that last had a Democratic senator in the mid-1990s.