Presidential debate 101: Does $25,000 deduction cap make Romney tax math work?

http://www.csmonitor.com/USA/DC-Decoder/2012/1018/Presidential-debate-101-Does-25-000-deduction-cap-make-Romney-tax-math-work-video

At the last presidential debate, Romney floated the number $25,000. According to one analysis, such a cap on deductions would generate $1.3 trillion in revenues, short of the estimated $5 trillion in tax cuts.