What is it about Michigan that seems to encourage assisted suicide?

That is all I can think watching Michigan congressmen and senators, led by Representative John Dingell, doing their best imitations of Jack Kevorkian and once again trying to water down efforts by Congress to legislate improved mileage standards for Detroit in the latest draft energy bill.

Look, I get pork-barrel politics. I understand senators from oil states protecting the windfall profits of oil companies. Ditto for farm subsidies. It’s an old story: Protect my winnings, and I’ll reward you with campaign contributions. I get it. I get it.

What I don’t get is empty-barrel politics — Michigan lawmakers year after year shielding Detroit from pressure to innovate on higher mileage standards, even though Detroit’s failure to sell more energy-efficient vehicles has clearly contributed to its brush with bankruptcy, its loss of market share to Toyota and Honda — whose fleets beat all U.S. automakers in fuel economy in 2007 — and its loss of jobs. G.M. today has 73,000 working U.A.W. members, compared with 225,000 a decade ago. Last year, Toyota overtook G.M. as the world’s biggest automaker.

Thank you, Michigan delegation! The people of Japan thank you as well.

But assisting Detroit’s suicide seems to be contagious. Everyone wants to get in on it, including Toyota. Toyota, which pioneered the industry-leading, 50-miles-per-gallon Prius hybrid, has joined with the Big Three U.S. automakers in lobbying against the tougher mileage standards in the Senate version of the draft energy bill.