Cynical.
Congress won't legislate restrictions on their own bribes; that's why the Judiciary has to. This is a classic check and balance. The "culture" of Congress will never be broken, in the same way that the culture of criminality will never be redeemed. The best we can do, as the Federalists pointed out, is oppose force for force -- in this case, oppose the self-interest of the elites with the national interest.
Our most serious problems are caused by failure to fully apply checks and balances. Congress shirks its responsibilities so the Executive becomes over-powerful. Both Congress and the President owe their positions to big money; the President appoints FIFA-esque jurists who look the other way on bribery, so there is a vicious cycle of super-wealthy interests owning and operating the country for their self-interest at the expense of the vast majority of voters. This has happened before, and the Progressive Movement fixed many of the abuses. As long as the electorate has not been tranquilized by corporate media and entertainment and divided/distracted by campaign-tactic culture wars, that can happen again. And if it doesn't, frankly, we don't deserve our democracy anyway.