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Re:Shame on me for voting for a retroactive tax in Prop 30 by mturmon on Monday December 17, 2012 @06:32PM (#4935150)
This is tinkering with marginal tax rates, not retroactively making peeing while standing up a felony.

More seriously, there is a distinction between civil and criminal ex post facto laws (civil, including taxes: generally OK if there is a rational basis; criminal: essentially never due to Article 1 of the US Constitution).

For more, see http://en.wikipedia.org/wiki/Ex_post_facto_law#United_States

Re:Shame on me for voting for a retroactive tax in Prop 30 by chernevik on Monday December 17, 2012 @06:49PM (#4935240)
"The power to tax involves the power to destroy." John Marshall, McCulloch vs Maryland