You wrote: "How could be Obama good for Hillary?"

I hate rhetorical questions. They are arrogant. You don't know everything. Actually you know next to nothing.

"He is ahead in many states"

Wrong. He is ahead in one state - Illinois. Want the links or can you look it up yourself?

", and young people, certainly, prefer him. Other age categories also."

Doesn't matter if you don't have the votes.

"Hillary raised money, utilizing for her campaign Katrina and Aids fundraising of two previous ex-prez. He still was able to overleap her. At any other point of view he is much better simply because he doesn't have such tail of dirty pre-history and compomising votes as she has."

Then vote for him, but he won't win. Money isn't everything.