senator chris coons and our koip. hillary clinton facing a tightening race. she called in backup today making her first joint appearance with the first lady, michelle obama. our senior political correspondent brianna keilar is here. brianna, the first lady is being called "the closer." >> she is so well liked. at wake forest university getting help from her friends, trying to court millennials. according to a harvard institute of politics poll, she could do better against donald trump in terms of the margin, if not the overall performance, than barack obama did in 2012. >> first ladies, we rock. >> reporter: as hillary clinton pushes toward election day in north carolina, she's got some very popular company. >> as our first african-american first lady, she has faced pressures i never did. [ cheers and applause ]