President Obama's hyperactive regulators went on hiatus in 2011 to get through Election Day. Now with his second term secure, they're about to make up for lost time and then some.

The government defines "economically significant" rules as those that impose annual costs of $100 million or more, and the Bush, Clinton and Bush Administrations each ended up finalizing about 45 major rules per year. The average over Mr. Obama's first two years was 63 but then plunged to 44 for 2011 and 2012 so far. The bureaucracies didn't slow...