If there are spoilers from the left they will split the Democratic vote. I also suspect that there will probably be them from the far left that think their candidacy is more important than anything else.
Because spoilers from the left (I know, there is no left) will make sure that the Dems will not win. If that is the case then we got Jackass for another 4 years, Unless, of course, he is got rid of. Even then, the Republicans will put up somebody else with the same wet dreams.