However, there are rumors of Dan Winslow, a MA state legislator, considering a run. Winslow is close to Romney and was part of American Elect, therefore a moderate Republican. This said, the media have in on record saying he is not sure there is place in the Republican party for a socially moderate Republican like him.
http://thehill.com/blogs/blog-briefing-room/news/280715-massachusetts-state-gop-rep-mulls-run-for-kerrys-seat
In a statement, Winslow said he was "honored by so many calls and emails urging me to run for the United States Senate," adding that he would consider mounting a run over the weekend, taking into consideration whether the GOP could back a Republican with more socially liberal positions.
In particular, he said he would consider "whether there is room in the national Republican Party for a member who is both fiscally prudent and socially tolerant."
Read more:
http://thehill.com/blogs/blog-briefing-room/news/280715-massachusetts-state-gop-rep-mulls-run-for-kerrys-seat#ixzz2Jsu1OnFp
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If he has to ask, the answer is probably NO.
Which leaves few alternatives, Keith Ablow, Kerry Healey, and a business man Gabriel Gomez. Tisei has already announced he will not run (he answered the question Winslow is asking, I guess.