Is your Congressman smarter than a 3rd Grader?

Not if he is Michigan's Don Shimkus.  Via Matt Yglesias, here are his recent erudite comments on global warming…

SHIMKUS: It’s plant food … So if we decrease the use of carbon dioxide, are we not taking away plant food from the atmosphere? … So all our good intentions could be for naught. In fact, we could be doing just the opposite of what the people who want to save the world are saying.

If my 3rd grader can understand that you can have too much of a good thing, you'd hope a member of Congress would.  Then again, intellectual rigor is not exactly a hallmark of the House Republican Caucus.