Obama Proposal Likely Unresolved This Year, Aviation Week
"Continuing opposition in Congress to the "game-changing" policy shift is making it more likely that NASA funding will be handled as a "continuing resolution" this year, instead of an appropriations bill reflecting the changes Obama wants. That would add to the confusion, because it would leave NASA to continue working on the Constellation Program that is killed in the agency's Fiscal 2011 budget request."


There are some good reporters here so their opinion has heft...however there is nothing concrete as to why the budget wont get passed. Just as I doubt a compromise is coming so I also bet NASA's budget gets passed pretty much as is.
The politics of the next few months in non space things should be fascinating.
Robert G. Oler