I've already agreed that we should vote. But it's not enough.
Progressive ideas have effectively been taken off the table since the Cold War. Even if we can get more progressives in Congress, the establishment dems sideline them. It's easier for both parties to move to the right because this does not threaten the wealth and privileges of the oligarchy.
Any progressive running for president is, for that reason, fighting against the odds. And when they lose, they take the energy behind their campaign and redirect it to support "centrist" democrats. That's it, two political parties and we call ourselves a democracy.