Christie/Daniels pulls a landslide victory (in the context of our hella divided times). Biden does have charisma, but he also is a gaffe-machine, and people are very prone to not taking him seriously. He might have a surge of support due to the debates against most candidates, but Chris Christie successfully blocks that considering he's as aggressive and charismatic. The running mates also cancel eachother out: both fairly competent, and fairly boring. If Warner were on the ticket, they would win Virginia outright, but Kaine isn't nearly as popular so they lose it narrowly.
My prediction, being generous to Biden:
Christie/Daniels: 53% 330 Electorals
Biden/Kaine: 45% 208 Electorals
Other: 2%