Hillary Clinton wants a do-over in Michigan and Florida, because those two states had primary elections that the Democrats decided wouldn't count because the states did not follow the Democratic party rules.  Hillary Clinton is behind in the delegate count for the Democratic Presidential nomination, and those are two states that she would likely win and move her closer to Barrack Obama and improve her chances in convincing "Super Delegates" (no they are not action heroes) that she should be the Democratic nominee.  Obama does not want a do-over, because it could only hurt him.  Instead, he favors splitting the delegates from the two states 50-50 so that they are counted.  Never mind that this is not how the states would actually have voted.  If their positions were reversed, Obama would be fighting for the do-over and Clinton would want to leave it as is.  Neither really cares about everybody being represented, unless it benefits them personally.

 The Democratic Party already has the most convoluted rules for selecting delegates.  I think you can get college credit for taking the course in understanding how it works.  After this year, you can bet that they will make major changes in the system again.  If the Democrats had a similar system to the Republicans, Hillary Clinton would already have clinched the nomination.  The Democrats ruled out the peoples vote in Michigan and Florida, because those states moved their primary elections to an earlier date, against the wishes of the Democratic Party.  Apparently it is the Democratic Party that doesn't want to count every vote.