62% of the US federal budget goes to entitlements (Medicare/Medicaid/Social Security). That's ONLY $2 Trillion. 18.7% goes to the defense spending. [1]
Implementing Obamacare will cost $4-$6 Trillion. WHERE DO YOU SUGGEST WE GET $4-6 TRILLION? Even if you cut 100% of the defense budget it won't be not enough to pay for Obamacare.
[1]http://www.heritage.org/research/reports/2012/10/federal-spe...