You obviously do not know very much about Clintons

If she endorses O, O would likely be President. She will miss next political season in 2012.

She would do as Clintons usually do: undermine O as much as they can to let McCain win so they can prepare 2012 comeback because:

1) McCain will be 76 years old in 2012;
2) GOP will have White House for 12 years.

2012 will definitely be the best chance for a Democrat.

The scenior will be quite different for Hillary if Obama win 2008. He will seek re-election in 2012.

This argment has evidences to support it: 2000 and 2004 Clintons did a lot of dirty things behind the scene to under cut Gore and Kerry just so Hillary can campain for Presidency in 2008.

Google Clintons thoroughly. You will find information regarding Clintons