Top contenders in the Democratic race for president, Joe Biden and Kamala Harris, came under fire from rivals during Wednesday night’s debate in Detroit. Biden defended so-called “Obamacare” and a public option for a “Medicare for All” overhaul. Harris’ support for that health care plan drew criticism from Michael Bennet as a vehicle for raising taxes on the middle class while Tulsi Gabbard chided Harris for jailing thousands over marijuana violations as a prosecutor.