Martina McBride is the latest act to drop out of the Donald Trump-affiliated Freedom 250 concert series for The Great American State Fair this summer, saying that it “turned out to be misleading.” The country singer-songwriter took to her Instagram on Thursday, telling fans that she initially accepted the opportunity thinking it was a nonpartisan event. “I would like to talk to you and clear the air,” she wrote. “I will not be performing at the Great American State Fair on June 25th. I was presented with an opportunity to perform at a nonpartisan event but that turned out to be misleading. I asked lots of questions and was assured this was a nonpartisan event that was meant to celebrate ALL 50 states. In my mind I thought this was a great way to celebrate the states and also bring people together in the way that only music can. I saw it as just a bigger version of so many state fairs I have performed at over the years, celebrating community and what makes each state special. Sounds fun, right?…