Regulate, Mandate, PotAto, Potato... let's call the whole thing off!

You say tomAto, and I say tomahto. You say PotAto and I say potahto... ah you get my drift. I read where a quote from the White House said:

The White House said Tuesday that the Supreme Court would be overturning "decades of precedent" if it finds Obamacare unconstitutional in a much-anticipated ruling expected later this week.

"We are, as I've said in the past, confident that the Affordable Care Act is constitutional, in keeping with decades of precedent under the Commerce Clause," spokesman Jay Carney told reporters aboard Air Force One. (He was referring to Article I, Section 8 of the Constitution, which states that Congress shall have the power "To regulate Commerce with foreign Nations, and among the several States, and with the Indian Tribe.")

So I looked up regulate in the dictionary and I can't find anywhere that it equates to the word mandate. Either, Eyether, Mandate, Regulate, let's call the whole thing off. If the Gershwins were alive today they'd be rolling in their graves.