A few more studies, all from prior to President Obama's entrance and policies, which sort of takes them out of the political arena for today's discussion !
CATO Institute....2002 found that higher marginal tax rates stifle economic growth...
http://www.cato.org/pub_display.php?pub_id=5693
The Heritage Foundation in 2001 in speaking of reviving the economy speaks directly to LOWERING marginal tax rates.
http://www.heritage.org/research/taxes/BG1443.cfm
Now Warren Buffet, a leading Obama supporter, said this week that billionaires, like him, should in fact pay more taxes BUT that overall taxes should be lower. (on this I am paraphrasing).
All of this just to get another perspective !!