Every so often politicians — usually Republicans — launch a campaign for a constitutional amendment that would term-limit members of Congress, and every time they do so the proposal goes nowhere, because duh.

It's that time of year again…

Republican senators Jim DeMint, Tom Coburn, Kay Bailey Hutchison and Sam Brownback offered such a measure on Tuesday, saying it would be good to get fresh blood on Capitol Hill.

"Americans know real change in Washington will never happen until we end the era of permanent politicians," DeMint said.

Absolutely, and that's why Jim DeMint has been so supportive of the fresh-faced, inexperienced newbie from Chicago who ran for president last year after serving less than a full term in the Senate… oh, that's right, no he hasn't. Well, what does it matter? Sen. DeMint's first term expires in 2011, and I'm sure he'll do the honorable thing by refusing to run again.

Just to set a good example for others.