Thomson ReutersFebruary 1, 2013 14:16
(Adds Brown, observer quotes)
By Scott Malone
BOSTON, Feb 1 (Reuters) - Former Republican Senator Scott Brown said on Friday he will not run in a June election to fill the Massachusetts U.S. Senate seat vacated by John Kerry, a move likely to dim Republican chances of picking up the traditionally Democratic-held seat.
Brown, who stunned the liberal establishment of Massachusetts with a win in another special election in 2010, lost his re-election bid last year.