Former Republican vice presidential candidate and Alaska Gov. Sarah Palin defended Donald Trump's conservative credentials and railed against the Republican establishment for "attacking their own frontrunner" while endorsing Trump in Iowa on Tuesday. "What he has been able to do, which is really ticking people off, which I'm glad about -- he's going rogue left and right," Palin said, referencing the name of her 2009 memoir. In a statement announcing the endorsement, Trump said, "I am greatly honored to receive Sarah's endorsement. She is a friend, and a high-quality person whom I have great respect for. I am proud to have her support."