Retiring Republican Sen. Bob Corker said Wednesday that he will not campaign against Phil Bredesen, the Democratic ex-governor who is running for his senate seat, calling Bredesen a good businessman and friend during a breakfast hosted by the Christian Science Monitor, per Roll Call.

Why it matters: Tennessee is one of the 3 most vulnerable Senate seats for Republicans, and though Corker said he would support whoever becomes the Republican Senate candidate — Republican Rep. Marsha is expected to secure the nomination — he said he doesn't plan to put any of the $6 million funds in his Senate campaign account toward the Tennessee race.