This is such a mystery to me... I was certain he would be the first to announce a run once Kerry was out. Didn't he say something like "I'm not finished... I'll see you again." to MA voters after his loss to Granny Warren?
I don't know what other viable Republican can run in MA. It's pretty certain now that you're going to end up with a Sen. Markey or Sen. Lynch (possibly another Sen. Kennedy, God help us!).
Living in the northeast sucks, doesn't it? :-(
Maybe Brown wants to run for MA gov in 2014
Of course, this wasn't apparent when Scott started his campaign. It took guts for him to run when few thought he would win. But he wouldn't be a likely winner this time by any means. His potential opponents would all be tougher than Coakley.
I suspect Scott Brown is tired. If he ran this time and run, he'd have to run again next year when Kerry's term expires. Four elections in four years would be draining for anybody.