Small pockets of dissent notwithstanding, the ruling class (i.e., international finance capital) owns both political parties.
Check who the major political donors are, who funds the NGOs, think tanks, and PACs which guide policy-making. Check who employs politicians after they leave public office and who pays their speaking fees. Check who owns the major media outlets. Check who funds the endowments of academic institutions. Check declassified CIA documents which show direct collaboration with entrenched monopolies in carrying out foreign coups and military interventions.
It’s a big club, and you’re not in it.
Till voters wake up and realize that the problem is not with other people’s representatives or the other party, we are doomed to repeatedly make the same mistakes.