Sen. John McCain (R-Ariz.) said Friday he was “concerned” about the infighting in his party during the 2012 Republican presidential primary and called on the candidates to ease up on each other. “I think they should be more respectful,” McCain said on CBS’ Early Show. “I am a bit concerned because, obviously, the people who are making this judgment [GOP primary voters] aren’t as much interested in seeing fighting as they are in judging the candidate’s knowledge, expertise and talent.”