UPDATE: Senate Majority Leader Harry Reid, D-Nev., indicates the Senate will take up clunker reauthorization later today.

Apparently, too many Mercedes-Benz, Lincoln and Lexus luxury barges are showing up on cash for clunkers lists. Now one senator wants to make reauthorization of the program, costing taxpayers another $2 billion, contingent on making sure only lower-income people benefit.

Sen. Tom Harkin, D-Iowa, would limit the program to individuals with adjusted annual gross income of less than $50,000 or joint filers earning less than $75,000, The Washington Post reports. It's one of several amendments likely to get voted down.

Is Harkin on the right track? A reporter from the Los Angeles Times found a salvage yard of clunkers turned in under the program studded with luxury cars,including a Mercedes-Benz and a good-looking, seven-year-old Lincoln with leather seats and all the goodies. They apparently didn't appear to belong to people who who might otherwise not be able to afford a new car sometime soon.

A 1988 Lincoln is crushed under Cash for Clunkers, by Tom Dejak/AP