They could only vote for Clinton. No write-ins were allowed. Hillary says that's completely fair. She should get all her delegates and Obama should get none. But at the DNC meeting, all of Clinton's supporters backed down on that, and demanded only a 73-55 split.
That would have given her 57% although she won on 55% of the popular vote. But many Democrats who could not vote for Obama or Edwards voted Republican because they wanted to help McCain over Romney and Huckabee. In fact so many voters were discouraged, especially those who could not vote for their candidate, that Michigan had only a third the turnout of similar primaries.
The best
statistician in the business, who combines all poll results, estimates that Obama would have actually won by a whisker if his name had been a fair election. And Hillary was given 69 out of 128 or 54% of the delegates.
The DNC was willing to give Obama more delegates in both Florida and Michigan, but Obama
instructed his representatives not to accept such a favorable settlement.
Clinton bucked Democratic pressure and kept her name on the ballot, while Obama and Edwards took their's off. Here's what she said on TV as she did that:
Of course she knew it would almost certainly count for something, and she knew by cheating a bit, she'd likely gain an advantage. But by her own words, it should not have counted and she should have gain no advantage.