Here's a question for you political junkies. Why did prohibition require a Constitutional Amendment? The answer is that there was universal agreement that Congress didn't have the authority to ban alcohol. After all, the federal government only had the powers that were enumerated in the Constitution--and the Constitution certainly didn't confer on Congress the power to ban Alcohol.
How quaint. Now Congress decides what type of light bulb you can buy.
Sometimes we forget just how pervasive the federal government has become. I thought this screen shot from AzCentral was a nice reminder.