Former U.S. Sen. Scott Brown told the Herald he is exploring a possible 2016 presidential bid today as he hit a well-worn stomping ground for Oval Office hopefuls – the Iowa State Fair. “I want to get an indication of whether there’s even an interest, in Massachusetts and throughout the country, if there’s room for a bi-partisan problem solver,” said Brown, who has been meeting with top republicans nationally and last week hosted a Fenway event for Republican National Committee members. Brown indicated he isn't close to deciding whether he will run. “It’s 2013 I think it’s premature, but I...