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You have to give Bobby Valentine credit. He is totally unapologetic for who he is.
In some ways, it's easy to see why Valentine is appealing as a managerial candidate. He is brash. He doesn't stand for any nonsense from his players. It's his way or the highway. Sometimes, this works well for coaches (see: Belichick, Bill).
In the case of Bobby Valentine, however, it did not.
In the midst of the 1985-86 season, Valentine took over for Doug Rader with the Texas Rangers. In his first full season as manager, he led the team to a second-place finish in the AL West, but it seemed that success was an aberration: After two more seasons and many, many losses, Valentine was fired by George W. Bush, who is a pretty cool person to be fired by.
Valentine returned to the majors in 1996, revitalizing a franchise that had notoriously struggled of late. Even though his team was winning, though, Valentine blew it in 2000 when he made an appearance at UPenn's Wharton School of Business and allegedly spent his time smack-talking his players and his organization. He was fired in 2002.
And yet, the Red Sox thought Valentine might be the perfect candidate to replace Terry Francona after Boston's infamous collapse in September 2011. They were very, very wrong. Boston's Valentine experiment was an unmitigated disaster, and the team finished with its worst record in 47 years. Shockingly, he was fired once again.