FILE – In this Feb. 25, 2016 file photo, Democratic presidential candidate, Sen. Bernie Sanders, I-Vt. listens to concerns about contaminated water during a community forum at Woodside Church in Flint, Mich. Flint, a majority-black impoverished community in a state run by Republicans, has become a dominant issue for the Democratic candidates before Tuesdays primary in Michigan, so much so that they will return to the city for the seventh Democratic debate on Sunday. (AP Photo/Jacquelyn Martin, File)