Hillary will destroy any opposition- not thru fundraising or threats but thru poise and experience... it would be moronic for any Dem to run against her and waste time, money, and political capital
I suppose only "grassroots" candidates like Obama and Edwards can take Hillary on.
If Obama beat Hillary in 2008, then certainly another Democrat can beat Hillary in 2016.
Besides, some of those guys are getting older, and the window for Prez or VP is narrowing.
I'm sure Bayh, Feingold, and Cuomo will be more likely to run, if at least to get some exposure for VP or 2020. Only losers play it safe on the sidelines.