President Obama said last month that America can educate its way to prosperity if Congress sends money to states to prevent public school layoffs and "rehire even more teachers." Mitt Romney was having none of it, invoking "the message of Wisconsin" and arguing that the solution to our economic woes is to cut the size of government and shift resources to the private sector. Mr. Romney later stated that he wasn't calling for a reduction in the teacher force—but perhaps there would be some wisdom in doing just that.

Since 1970,...