Sanders slips in polls, raising doubts about campaign

Sanders slips in polls, raising doubts about campaign-thehill: Sen. Bernie Sanders (I-VT) is slipping in polls following the first Democratic debate, raising questions about whether he can recapture the insurgent energy that nearly carried him to the party's presidential nomination in 2016. Three new polls released after the first Democratic debate show Sanders falling into fourth place behind former Vice President Joe Biden, Sen. Kamala Harris and Sen. Elizabeth Warren.