Did Mitt Romney and Bain Capital help office-supply retailer Staples create 88,000 jobs? 43,000? 252? Actually, Staples probably destroyed 100,000 jobs while creating millions of new ones.

Since 1986, Staples has opened 2,000 stores, eliminating the jobs of distributors and brokers who charged nasty markups for paper and office supplies. But it enabled hundreds of thousands of small (and not so small) businesses to stock themselves cheaply and conveniently and expand their operations.

It's...