TREYNOR, Iowa – Mitt Romney today returned to Iowa, a state that delivered a crippling blow to his candidacy in 2008, exuding a certain amount of confidence. “There’s a good shot I might become the next president of the United States,” he told community leaders here at a business roundtable at Treynor State Bank. “It’s not a sure thing, but it’s a good shot.” Romney has generally not focused his campaign on Iowa, a state that he staked much of his candidacy four years ago only to lose both the caucus vote and, perhaps more importantly, the game of expectations....