The difference according to Larry Lessig:
(1) Character - Bill and Hillary Clinton have shown in the past that principles are expendable. One minor example - she refused to endorse the call to make presidential debates free from copyright, fearing that it might hurt her fundraising efforts from big business.
(2) Integrity - Hillary Clinton blatantly lies about Barrack Obama.
(3) Ideals - Hillary is "good enough" to continue the current divisive politics that everyone hates, Obama inspires change and peace.