AMT Repeats

In 2007, the state of Maryland instituted a "millionaire tax" surcharge (in Maryland, a millionaire is someone who earns more than $500,000). The state said it would raise $330MM in additional revenue (which the legislature promptly spent). According to the Maryland Public Policy Institute the tax raised $120MM, instead of $330MM, and the government, as usual, is flabbergasted that this result repeats itself every time it's tried.
The President is proposing a new alternative minimum tax on millionaires (Obama thinks you're a millionaire if you earn $250,000). What do you think the odds are of that tax raising anywhere near the revenue he claims it will? And what do you think the odds are of that tax ensnaring millions of taxpayers in the future just like the current AMT did?