shows former vice president joe biden widening his lead among his rivals with 34% of democratic voters saying he is their top choice. that's biden's best showing in cnn polling since april. so we'll break down where biden is getting support and how the other candidates are faring. first, back to our top story. jeffrey toobin is a former federal prosecutor and cnn chief legal analyst and david axelrod, former senior adviser to president obama and host of the ax files on cnn. bill taylor's opening statement, 15 pages. it was a gripping, compelling read. and he just talks about, again, this wasn't his feeling. this wasn't his hunch that these -- that the aid was tied to investigations. he had evidence of it. and so here's just the top line, headline of it. he writes, in august and september of this year, i became increasingly concerned our relationship with ukraine was being fundamentally undermined by an irregular, informal channel of u.s. policy makes and by the withholding of vital