I hate to interject a little logic in here, but please try to tolerate it for a moment.
How do you think a politician gets elected? With good wishes and determination? Nope, its money, pure and simple. And where does that money come from? From you? Certainly not, because you indignantly proclaim them to be corrupt from the get-go. So where do they get it? From the welfare cases? The middle class? Nope. The truth is that probably 90% of Americans don't contribute to political campaigns, either with their money or their time. They expect other people to write the checks. Heck, most don't even vote anymore.
So, when Mr. Politician gets elected, he has a couple of choices: (1) try to represent EVERY view of EVERY constituent, which means he will please no one, (2) try to please his core constituency (which, BTW, worked for him and contributed money to his campaign). Along with the latter, he must also pay special attention to the concerns of his big money donors if he has ANY aspirations AT ALL about ever being elected again. If he doesn't (now listen up class, this is important), they won't contribute to his campaign again.
When this guy loses his big-money donors, who will make up for the slack when it comes to funding the election machine? You? Nope, because as a good ol' dyed-in-the-wool cynic, you think he's already corrupt by definition. And, if by some miracle, you actually think he did a good job and stuck by his guns, you're not going to contribute monetarily anyway.
Result? Mr. Politician is beholden to no one and therefore receives high praase from a VERY small minority who actually pay attention to these things, but only token funding support. His record is not publicized, and the sitcom-watching public thinks he hasn't done a doggone thing. He gets defeated, and the whole cycle starts again. Meanwhile, you sit back in your chair and continue to whine about the "system," ignoring the fact that you are every bit as responsible for it as anyone else.