Here is why I was a Hillary supporter in 08 and will be again in 16. POTUS is a job, perhaps the hardest job in the world. As with every job, it carries a learning curve. My guesstimate is that the learning curve for the POTUS job is about three years. In other words, it takes a person new to the job about three years to get the hang of it such that they can make some real progress on their agenda.
One could make the case that Obama largely floundered for the first few years with that "bipartisan" stuff that went nowhere. Yes, having or not having Congress makes a huge difference.
My point is that I want someone in the POTUS job who is not going to lose huge chunks of time trying to figure out who the Rs are and how to beat them. No one on the planet has taken more shit from the GOP in that last 20 years than Hillary. She has no illusions about the GOP.
Also, I like the fact that she is at the end of her career. She will be focused on her legacy and what good works she can leave behind. She also has the best chance of winning because both Bill and Barack will be bring unprecedented amounts of money and attention to her campaign.
Last but not least, Hillary represents the best chance of me seeing us elect the first female POTUS in the history of the country, in my life time. I'm a man and I want my daughter to see us elect a woman President. This is something I personally am willing to put everything I have into. I suspect I'm not alone in how I feel about this.