"I'm saying they're equally corrupt and not working for the benefit of their constituents"
That's Washington. What you say is not true (largely) for the lower levels of politics. The pinnacle of those lower levels of politics is State Governor. Generally, governors can still be men (or women) of the people, Largely uncorrupted. (you owe favors the moment you enter politics; I hope you didn't mean that.)
Compare Senators vs. Governors in our recent history for one thing. Once you're President, you seem to get corrupted pretty quickly; some quicker than others. Some have to be shot to get the message... But even after that, they still make decent executive administrators.
For another thing, as they enter the national arena is your chance to pick your uncorrupted constituent based politician. The primaries.
I should get to vote for Elizabeth Warren over that shrew-woman Hillary, AND; I should get to vote for Scott Walker over disqualified-himself-over-Terry-Shaivo Jeb. Then, after seeing the two of them debate each other, solidify positions, etc, hopefully, I get to cast my vote for president with a clear choice and conscience.
Hell, in my state, I have to register with one or the other long before I will even know who the candidates are. Meh, the way they do it, all staggered out; the candidate is likely to be decided before I get to vote.
Fix the primaries, and you fix our politics.