[Joe]

Obama and his wife just recently paid off their school loans. From what I've read, Michelle told Barack he needs to finish his political career fairly early so they can make some money. She does not want him chasing the presidency again.
Think about it - eight years ago, the Clintons were essentially broke - now Hillary is in a position to loan her campaign five million.
I don't think this applies to the "true believers," but for most, politics is about becoming rich and powerful - but with the emphasis on power. Becoming a national figure - whether you win or lose - is akin to hitting the lottery. We live in an age where, in the hands of a manipulative person, even a modicum of celebrity can translate into vast opportunity.