By then, the steady drumbeat of anti-Trump propaganda posing as "news" will have taken a further toll and Kaine will get the opportunity to prove that a Demonrat POTUS does not have to be partially black, raised by communist queers or the FIRST woman disciple of Saul Alinsky to be an American baby-killing, Islamo-ass kissing, enemy of the military and of American civilization new Stalin.
If Comrade Hillary cannot make it to the end of the campaign able to function, we will be informed (probably by Slick Willie) that Comrade Hillary is depending on YOU to vote Demonrat!
Kaine is definitely a stronger candidate and can easily replace Her Royal Heinous if she becomes too ill to function as president. This is why he was picked to be VP and not some second tier black or Hispanic minority candidate.