I'm pretty sure any political party would be in trouble if their campaign collapsed.
After the conventions, sure. But before the conventions? The Republicans wouldn't be in trouble if whoever the front runner of the day's campaign collapsed. If Rubio or Bush or whoever is forced out because their campaign collapsed, there are other viable candidates.
That's not true on the Democratic side. I can't see an unrepentant socialist or the failed governor of a very blue state winning the 2016 Presidential Election.
