Dominant Frontrunner News Today

>> and, adrian, you worked for hillary clinton. biden has been positioning himself in this field as the dominant frontrunner. and the polling has backed him up on that. but this is a real test for him. and michael bennet is somebody who has been a long-time advocate for building civil relationships and working across the aisle in congress even is at the point where he says the system is so broken, i dont understand why joe biden is harkening back to that. >> what joe biden stepped into is what a...

Beating hillary clinton in iowa 48% to 43%, while joe biden would beat trump, according to these numbers, 45% to 49%. alex seitz-wald joins us. more humor than heart. what does that mean? >> reporter: tamron, there comes a point in every campaign when the going becomes a little bit more rough and theyre trying to get the strategists and the polls out of the way. but you dont want it to come quite this early. clinton had a rough summer. she went from being the questionable, dominant frontrunner w...