The Popular Vote

Kos crunches the math on primaries and caucuses and comes to this conclusion - which is, so far as I can tell, irrefutable:

Obama's lead is about 833,000.

Unless Obama suffers an epic collapse, he should end this contest with a lead in the popular vote, a lead in the pledged delegates, and a lead in the number of states won.

Do the Clintons seriously intend to overturn that?