Mitt Romney could be too wounded from the drawn-out and increasingly bitter Republican primary battle to be an effective candidate against President Barack Obama, leading supporter Sen. John McCain suggests. And the GOP’s 2008 presidential candidate called on all four candidates left in the race to tone down the intra-party attacks and concentrate on policies. “This is like watching a Greek tragedy,” McCain told the Boston Herald, saying that negative campaigning and increasingly personal attacks “should have stopped long ago.” “Any utility from the debates has been exhausted, and now it’s just exchanging cheap shots and personal shots followed by...