Obama pledged delegates: 1629
Obama superdelegates: 256
Total: 1885

Clinton pledged delegates: 1459
Clinton superdelegates: 273
Total: 1732

Amount Clinton has to win to catch Obama in pledged delegates: 89%

details:
1629-1459=170 Obama-Clinton to get difference
217-170=47 take the delegates remaining and subtract the difference
47*50%=24 half the delegates Clinton needs of the difference to stay even
170+24=194 the difference plus half the remaining needed to catch Obama combined
194/217= 89% needed/what's possible = %

Remaining races:
Kentucky - 51
Montana - 16
Oregon - 52
Puerto Rico - 55
South Dakota - 15
West Virginia - 28