“ i ’ m in , ” winslow said . ” many of the bigger - name republicans , including former state rep. daniel b. winslow became the first republican to officially join the u.s. senate special election to replace secretary of state john f. kerry yesterday , saying he is “ 110 percent ” committed to what will be a short but potentially bruising race . state representative daniel b. winslow , a former judge and onetime aide to governor mitt romney , said thursday he is entering the special election for the us senate , the first republican to officially declare his candidacy . ” winslow is the first republican to officially enter the race after democratic u.s. reps . before that , he was a district court judge . nex month , winslow said , he will resign from his law firm , proskauer , where he is senior counsel in the litigation department . advertisement - continue reading below on monday , he said , he is flying to washington to meet with republicans on capitol hill and with the national republican senatorial committee , which controls much of the party ’s national fundraising . tarr said he will make a decision as to whether he is in or out of the race “ no later than monday . stephen f. lynch and edward j. markey announced they were running .