The past five years have been a whirlwind for Republican Scott Brown.Once trailing Democrat Martha Coakley in the race to fill the late Sen. Ted Kennedy's seat in Massachusetts by 30 points, Brown rode a wave of Tea Party fervor and anti-establishment sentiment to defeat Coakley by a five-point margin. The loss of the liberal lion's seat hit Democrats hard, but the party knew it would have a much better chance of ousting Brown in 2012, when the seat's full six-year term was up for election.