Investors are told to ignore politics. That was before Trump 2.0

Open this photo in gallery: Warren Buffett walks through the exhibit hall at Berkshire Hathaway Inc’s annual shareholder meeting in Omaha, Neb. on May 4, 2019.SCOTT MORGAN/Reuters Warren Buffett has had a few things to say over the years about how investors should factor political leadership into their decision-making. His approach boils down to one word: Don't. "Probably half the time in my adult life, I've had a president other than the one I've voted for, but that has never taken me out of stocks," the billionaire investor and chief executive of Berkshire Hathaway Inc. told CNBC in 2017, near…