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Brad Childress is not on this list because of his record. He is on this list because of how he viciously mishandled the last two years of his career.
Once his Vikings team added Brett Favre in 2008, it put the team over the top. The Vikings struggled in pass protection, but Favre is a tough guy, and the presence of a passing game to pair with the young stud Adrian Peterson was extremely welcome.
With Favre in '08 and '09, the team had 10 and 12 wins. There were still moments, however, where you could tell the team didn't believe in Childress. He wasn't very good with his challenges and clock management. He'd move away from using Peterson when it counted—something just wasn't right.
In the 2010 offseason, Favre probably intended to quit. However, Childress went to Favre's personal house (as did several other teammates) and pleaded his case for Favre to return. He did, but not at full intensity, and Childress' offensive line was too old and decrepit to keep Favre upright.
More importantly, Childress had lost his locker room. No one respects a coach who makes it painfully clear that he needs one player. As a coach, you have to believe in every one of your players and support them all, and Childress did not do that.
That's why he was fired after starting 3-7 in the 2010 year.