The Fat Lady Is Singing (I Think)

It looks like the long, interesting, and historic Democratic presidential primary is finally coming to an end. Most news outlet are now reporting that Hillary Clinton will be suspending her campaign this Saturday. I wonder why she stay in the primary till the end when she has little chance to winning the nomination, and now she is only suspending rather than ending her campaign. Some say she stayed in to raise money to pay off her campaign debt. Others say she wants the Vice President slot. But why would someone who has already been co-President for 8 years want to be Vice President?