Biden visits Michigan amid effort to rebuild ‘blue wall’

WARREN, Mich. (AP) — Joe Biden is hoping to win back Michigan, Pennsylvania and Wisconsin this fall. The three states traditionally make up what Democrats considered a “blue wall” protecting their electoral hopes. But Donald Trump’s surprise wins in all three in 2016 helped him win the White House. Now, Democrats hope Biden’s appeal to white working-class voters and an earlier start to campaigning in each state will help them avoid the mistakes Hillary Clinton made