WASHINGTON — US Senator John McCain on Sunday expressed concern about growing isolationism in the Republican party, particularly among those vying for the 2012 presidential nomination. McCain, the 2008 Republican nominee, said he was alarmed to hear various candidates at a campaign forum last Monday express opposition to US military involvement in the NATO military assault on Libya's Moamer Kadhafi. "There's always been an isolation strain in the Republican party, that Pat Buchanan (a former Republican presidential contender) wing of our party. But now it seems to have moved more center stage, so to speak," he said. There is no...