In the age of Trump and cable news soundbites, political feuds are often perpetuated by a politician’s own words. Sen. Kamala Harris (D-CA) went after former Vice President Joe Biden directly on the debate stage, questioning his record on race by invoking his comments about a 1970s-era busing program. Sen. Amy Klobuchar (D-MN) dug into Mayor Pete Buttiegieg’s courtship of top-dollar donors by calling out his “wine cave” adventures.