Obama's record becomes target as candidates focus on Biden; Biden "surprised" rivals went after Obama's record when challenging him in debate; Harris says she's expected to take hits from 2020 rivals; Biden: "absolutely bizarre" rivals attacked Obama's record; Biden laughs off his debate stumbles and gaffes; 2020 candidates announce fundraising boosts after debate; Bullock announces biggest fundraising day since joining race; Trump announces new tariffs against China; Biden: I was surprised by criticism of Obama during debate; Trump: I don't know if I can stop "send her back" chant; House Dems nearing majority in favor of impeachment inquiry; U.S., Russia to withdraw from Cold War nuclear treaty tomorrow; Trump orders medals stripped from navy lawyers who tried Navy seal Eddie Gallagher on murder charges; KY miners stranded without pay, block train demanding money from bankrupt company; via Knit