Bill Weld did in 1994 I think.
That was gubernatorial, not senate.
Anyway, it must be a misprint or a polling oddity. Mr. Wonderful may be doing well but there's no way an unknown Democrat pulls only 9% of the vote in Massachusetts or 45+ other states.
Maybe not. 78% of respondents never heard of Warren. Maybe the candidates paired against Brown weren't specifically labled "the Democratic candidate".
So Joe Jr. has that good a shot, eh? He really needs to run. The whole "it's not the Kennedy seat, its the people's seat" meme that proved so devastating to Coakley a year ago will likely be stale by next year. You add the campaign environment where Brown inevitably has to start defending his moderate-only-compared-to-Mitch-McConnell voting record, plus Obama carrying the state by 25+ points worth of coattails (maybe slightly less against Romney), and suddenly Brown is in serious trouble.