Obama won among people who feel like the economy is doing well and Hillary won among those who disagreed. Obama won among college graduates, Hillary won among those who didnt graduate college. If this pattern persist, Obama will lose.
Mondale/Hart.
Clinton/Tsongas.
Gore/Bradley.
Hart, Tsongas and Bradley won the same demographic as Obama. Mondale, Clinton (Billy and Hillary) and Gore won the less well off…and the nomination.