--Rep. Charlie Rangel, D-New York, before walking out on his ethics hearings.
From Noah Webster's 1828 dictionary (see sidebar for the link), we see:
STUPID, a. [L., to be stupefied, properly to stop. See Stop.]...
1. Very dull; insensible; senseless; wanting in understanding; heavy; sluggish.
O that men should be so stupid grown, as to forsake the living God.
With wild surprise, a moment stupid, motionless he stood.
2. Dull; heavy; formed without skill or genius.
Observe what loads of stupid rhymes oppress us in corrupted times.
1. Careless; heedless; apt or accustomed to omit what ought to be done; inattentive to business or necessary concerns. It is applied to a particular instance of neglect, or it denotes habitually careless or inattentive. 2 Chronicles 29. 2 Peter 1.
He that thinks he can afford to be negligent, is not far from being poor.
Be thou negligent of fame.
CORRUPT, v.t. [L., to break.] Literally, to break, separate or dissolve. Hence,
1. To change from a sound to a putrid or putrescent state; to separate the component parts of a body, as by a natural process, which accompanied by a fetid smell.
2. To vitiate or deprave; to change from good to bad.
Evil communications corrupt good manners. 1 Corinthians 15.
3. To waste, spoil or consume.
Lay not up for yourselves treasures on earth, where moth and rust doth corrupt. Matthew 6.
4. To defile or pollute. Exodus 32.
5. To entice from good and allure to evil. 2 Corinthians 11.
6. To pervert; to break, disobey or make void. Malachi 2.
7. To pervert or vitiate integrity; to bribe; as, to corrupt a judge.
8. To debase or render impure, by alterations or innovations; as, to corrupt language.
9. To pervert; to falsify; to infect with errors; as, to corrupt the sacred text.
So, tell me again, why would we want a stupid and negligent congressman even if he isn't corrupt? It seems to me that a stupid and negligent congressman fits the definition of a corrupt congressman pretty well.