Ex-Iowa State Sen. Kent Sorenson defected from Michele Bachmann's campaign before the 2012 Iowa caucuses. In a 2014 plea deal, he admitted that he lied about payments from the Ron Paul campaign.
Donald Trump, seen sitting with his wife, Melania, at the U.S. Open Tennis Championships. He landed in controversy again after he was quoted by Rolling Stone mocking Carly Fiorina and her "face."
Donald Trump speaks to the media at the U.S.-Mexico border in July. The Libre Initiative's letter doesn't call out any candidates by name, but Trump has called for mass deportation and an end to birthright citizenship for immigrants.
A man carries a cardboard cutout of Hillary Clinton in Des Moines, Iowa. Clinton and other traditional candidates have struggled to breakthrough as outsiders have captured the attention this summer.
Donald Trump and Jeb Bush were polite to each other at the first GOP debate. But it's been gloves off since then, especially on Instagram, a social media outlet not known for its vitriol.