This is an excellent article by Laura Clawson in The Daily Kos:
Like the Michelle Goldberg article I linked to somewhere else, without slamming anyone or deifying anyone it gives a thoughtful and measured explanation of how this person decided Hillary was the best choice.
Excerpts:
"...I simultaneously want a more serious and nuanced class analysis—something deeper than the talking points, more flexibly targeted to specific questions rather than broad strokes—and more willingness to depart from the talking points, to acknowledge that sometimes you really can’t turn a question to your subject of choice. When the time is right to talk about inequality, try to fit the statistics to the moment. When the time is wrong, at least pretend to notice. Clearly Sanders’ talking points are working for lots of people, and I don’t doubt his commitment on these issues, but the repetition has failed to give me anything new or interesting to hang onto. And beyond inequality, the repetition is a problem with how he talks about—or avoids talking about—other major issues, which he so often dismisses. A president has to be willing to take on issues they don’t necessarily care the most about, able to become an expert on anything, able to pivot and start to care. I need more than “trust me,” and I don’t see Sanders failing to give me that, I see him refusing to do so. That’s not confidence-inspiring...."
"...How will Sanders win not just the presidency but the ability to get a big agenda through Congress? The people will rise up. Except Bernie Sanders is not organizing the people to rise up. He’s running a fairly conventional presidential campaign. Sanders is a long-time member of Congress who has yet to create the kind of movement he’s now suggesting will simply rise up despite the absence of the kind of organizing effort that would take. This will be difficult, and he’s not fully owning that or explaining how we’ll get through the challenges, especially given below-2008 Democratic turnout in Iowa and New Hampshire. It’s a set of promises resting on a fundamental misdiagnosis of how movements and organizing work, and I don’t know whether Sanders believes his line or is selling a line, let alone which would be more damning...."
http://www.dailykos.com/story/2016/02/14/1483010/-How-Bernie-Sanders-lost-me-and-Hillary-Clinton-won-me-over