- Joe Biden
 - Hillary Clinton
 - Andrew Cuomo
 - Bernie Sander
 - Martin O'Malley
 - Elizabeth Warren
 - Jim Webb
 
This chart places these 7 potential candidates (and President Obama) on a traditional moderate-to-liberal spectrum, and along an outsider-to-establishment axis.
Only one of these individuals will walk away with the nomination. While it seems like earning the Democratic nomination will be a cakewalk for Clinton if she wants it, stranger things in politics have occurred.

