Joe Biden, the 2020 Democratic frontrunner, accepted challenger Sen. Bernie Sanders’ apology late Monday over a blistering op-ed written by an unofficial campaign surrogate who blasted the former vice president as a weak candidate with a serious corruption problem. Zephyr Teachout, a Fordham Law professor, wrote the column for the Guardian that could be used as a roadmap for President Trump's re-election team in the general election. She described a candidate happy to be called "Middle-Class Joe," but whose political career is a bit murkier. She wrote he has a long history of supporting "finance over working-class Americans." Teachout, who...