Hillary was out of money by February, she was terribly mismanaged by her campaign. A couple of other missteps, Bill talking too much, she was making mistakes in debates and the delagates lost faith in her.
The only reason Repubs wanted her to win is because they thought she'd lose to McCain. She wouldn't have though. McCain/Palin was an even worse race than hers.
Obama simply outmaneuvered Hillary. He did the same to McCain.
Folks forget this. Hillary had no networks in place for States after Super Tuesday in the primaries. Hillary's strategy had always been to win the early states
just like McCain and declare victory early in order to move on to the general. Sadly for Hillary, the Democratic primary process worked differently than the GOP primary process. McCain won a few early states and locked his nomination, Hillary won a few early states but still had a fight on her hand.
Obama's organization just trounced Hillary in the back half of the process, much like it trounced McCain in the final months of the election. If the GOP wants to win in 2012, they've got to get better organized.
Did you know that the DNC and Obama have frickkin' iPhone apps. You can get news and talking points directly from the DNC and the White House and, get this,
donate money towards elections? From your iPhone. Does the GOP do that? Short answer, no.
That's why the GOP are in trouble. The DNC is better funded and organized. That's why stealing an election isn't necessary for the DNC. They'll just win it outright.