Earlier quoted context omitted.
At the turn of the century (yikes!) Clinton reconfigured the DNC to serve the corporations rather than labor. I left the party after that but am compelled to vote blue as the least worst option. Partisan politics allows capture of the government by creating a duopoly of power. Washington warned us of this threat.
You are correct, but it's largely our first-past-the-post voting system that forces only TWO political parties on us. Voting reform is necessary to help make other parties/candidates electable.
The media makes sure to qualify any candidate threatening the interests of capital as a "dangerous extremist", while "pro-business" candidates receive the lion share of donations for their campaigns. And there are many other guardrails in place to ensure nothing impedes the slow erosion of our infrastructure and public services under the strains of austerity in profit of the few.