Oh, this is way too much fun: Slate has a delegate counter that lets you move a slider for each of the remaining Democratic primaries and watch the delegate totals shift. You can indulge your wildest blowout fantasies and also see what will happen if every remaining race is a squeaker.
My personal guesses (which are probably hugely off, based on the general inaccuracy of the science of political prediction this primary season) keep Obama ahead by about the same margin he is now.
For those who are just dying to see Clinton in the lead, move the sliders so she wins 100% of the vote in Ohio and 86% in Rhode Island: See? For the moment, your wish comes true.