It seems outlandish doesn't it. Keep in mind that does not include primary real estate but I'm guessing the bulk of the lower group of millionaires would comprise mostly of 401k, Ira and Sep accounts.
I'm sure the number of millionaires also has to do with the age of the baby boomers.
The real thing that bugged me about increasing "income" taxes is that it doesn't touch the guys who left the arena so far. All our upper millionaires, billionaires simply will use tax advantage investing. Raines, Grasso etc are the people Congress uses as their rallying cry yet they have escaped any repercussion.
Poorgrad, The Washington Post article actually says the "normal" millionaire only earns $130k.