Those may be Opinions from 5 different people, but they are far from "Facts"

From their very own website.

The nonpartisan Urban Institute publishes studies, reports, and books on timely topics worthy of public consideration. The views expressed are those of the authors and should not be attributed to the Urban Institute, its trustees, or its funders.

An Updated Analysis of the 2008 Presidential Candidates' Tax Plans
Author(s): Leonard E. Burman, Surachai Khitatrakun, Greg Leiserson, Jeff Rohaly, Eric Toder, Roberton Williams


So it may be the view of these 5 people. ???

Last but not least does it really mattter at this stage? Either candidate is going to most likely say things that will help to get them into office. Pandering to the public. It is what they actually DO WHEN IN OFFICE that is important. What will they do while in office? The only thing we can do to try to figure that out is to look into their past, their history, their experience in such matters and that simply isn't possible with Barrack Obama.