CHARLOTTE, N.C. — AFL-CIO President Richard Trumka is leaving Charlotte on Thursday and will not attend President Obama's acceptance speech. Trumka is leaving early in order to avoid the travel crush at the Charlotte airport on Friday, according to a spokesman for Workers’ Voice, the AFL-CIO’s super-PAC. But there have been tensions between the Obama administration and organized labor for some time. Spokesman Eddie Vale said Trumka and others union officials' absence was not related to labor’s frustrations with Democrats. “Nope, this has nothing to do with that,” he said in an email. “We're looking forward to Obama accepting the...