TAMPA, Fla. — Mitt Romney’s campaign has stepped back from a major confrontation with fellow Republicans who were irate over what several ranking party officials had called a “power grab” by the presumptive nominee. The Romney campaign had won approval earlier of a change in the party’s presidential nominating rules that would allow Mr. Romney, if elected president, to veto already elected delegates from the 50 states and five territories to the next GOP nominating convention in 2016 and beyond. Even if Mr. Romney were not president come January, the rules change would have allowed future presidential nomination candidates the...
