Quick: What's the national minimum wage? If you're, say, one of three Republican candidates running in Missouri's U.S. Senate primary, you might be hard pressed http://www.youtube.com/watch?v=f7cIEMHYG0E to remember it. (It's $7.25) But if you're one of about 173,000 people living in Missouri, you can probably rattle it off the top of your head.