Dominant Frontrunner News Today : Breaking News, Live Updates & Top Stories | Vimarsana

>> 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 don't understand why joe biden is harkening back to that. >> what joe biden stepped into is what any frontrunner tries to avoid which is to provide an opening for tier ii, tier iii candidates to se...

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 they're trying to get the strategists and the polls out of the way. but you don't want it to come quite this early. clinton had a rough summer. she went from being the questionable, dominant frontrunner who basically had frozen out to seeing her numbers drop 10 points. and you have bernie sanders who ...