Hillary may be the favorite to win the Democrat nomination in 2016, but polling data in the last couple of years show that, even against an essentially empty field for the Democrat nomination, her support is eroding. The recent Wisconsin straw poll had Bernie Sanders, an old and out-of-touch socialist, with the support of 41% of Democrats, while Hillary had 49% support from Democrats.
How can this data be interpreted except that many Democrats want anybody but Hillary as the nominee? Everyone knows Hillary and has already formed a definite opinion of her. Her inability in that straw poll in a swing state tilting blue to even gain half of the Democrats in the poll says volumes about her appeal even to members of her own party.