I believe that the Democrats (faux-gressives) and Republicans (neo-cons and RINOs) have both proven repeatedly that their only motivations are selfishness and corporate sponsorship, and that they are clearly and quickly driving this country into the ground. There are a few exceptions (Bernie Sanders [I-VT], Ron Paul [R-TX], Elizabeth Warren [D-MA]) which stand out due to their altruistic positions, averse to their party's.
This country needs a third party that puts the needs of the common good over the needs of the few, or the one. A REAL progressive party, like that of Theodore Roosevelt. An altruistic party.