I still have not seen any reason for why the left should have anything to do with Hillary.
Simple: Hillary is the best chance for Dems to defeat the Republicans. Let's be honest; given the Tea Party and increasing fiscal conservatism of the GOP along with a growing fissure in the Democratic Party between the business interests & Occupy Wall Street Types, there is one unifying trait among them: they want to defeat the GOP.
To achieve that end, then Hillary is your candidate.
Who better to rally anti-big business voters then the most Wall Street oriented Democrat out there? Someone is going to get screwed in the end and isn't the guys rolling in the piles of cash.