Hillary Clinton's political strategy has clearly backfired over the course of this campaign as early on in the campaign, she only focused on big "delegate rich" states (e.g. California, Pennsylvania, Texas, etc.) while choosing to skip over many of the smaller states that Obama won with huge margins during his 11-state winning streak. So, now, the big question is: will Clinton bow out gracefully after the primaries in the far-flung primary states of Montana & South Dakota that her campaign now needs for some measure of respectability? She now has no chance of catching Obama in terms of delegates and reaching a compromise with Obama to be his running mate against McCain is increasingly unlikely as she has run such a negative campaign.
This leads us to the final political gasp that Clinton may have to persuade uncommitted superdelegates and that argument is that Clinton may do better than John McCain because she will have more popular votes, but here's the thing: how can a candidate who has run such a negative campaign be a more popular president than Bush or McCain? She has probably also ruined any chance of becoming Obama's running mate in November because chances are, Obama won't want to be associated with someone who has run negative ads against him for more than 5 months.
The bottom line is that even though Clinto won the Puerto Rico primary by a wide margin of 68-32, Obama still picked up delegates which has pushed ever closer to the magic 2116 delegates that he needs to become the democratic presidential nominee. The only way for Clinton to have even a long shot now is to beat Obama 100-0 in both Montana and South Dakota, which is impossible.