The plan, as put forth, is proposed to levy a .025%–.5% tax on stocks, .025%–.1% tax on bonds and .005%–.02% on derivatives with the funds going to health, public services, debt reduction, infrastructure and job creation.
Ignoring the claim that it's a "Robin Hood" tax, and that Robin Hood is being misunderstood here, the idea that it will capture wealth from the rich, or Wall Street, is not really supported in reality. What will likely happen is the same thing that happened when Sweden implemented their own financial transaction tax; the hard-core traders will simply start putting most of their transactions to foreign exchanges, and the bulk of those remaining will be the ones that can't easily switch, which are our pension funds, our 401Ks, etc.
The consensus amongst economic circles is that it will fail to attain even a significant fraction of the revenues it expects to, and that those taxes it does raise revenue from will impact the poor and middle class much more so than the rich it is targeting.
http://www.forbes.com/sites/timworstall/2012/06/20/the-stupi...
http://www.cnbc.com/id/45583134
http://www.telegraph.co.uk/finance/comment/kamal-ahmed/88722...