biden slammed the president for not being up front with the american people about the viruv. >> false promises. not leveling with how tough things are going to be. the american people have never been able to -- never failed to step up to what had to be done when it had to be done, but that's not happening now. >> reporter: and biden hit the president over the report in "the atlantic," denied by the white house, that he called war heroes suckers and losers. >> nowhere are his faults more glaring and more offensive, to me at least, than when it comes to his denigration of our service members, veterans, wounded warriors, the fallen. >> reporter: florida may be the closest and most important battleground of all. michael bloomberg is spending $100 million to help joe biden in florida. and donald trump knows this is a must-win state. the trump campaign has spent more in florida, david, than in any other state. >> all right, jon karl, our thanks to you tonight. and as i mentioned, the abc news town hall, "the president and