No, the Constitution’s Article 4, Section 4 “Republican form of government” clause doesn’t forbid the voters of Colorado from enacting a ballot measure (the “Taxpayer Bill of Rights,” or TABOR) that bars representatives from raising taxes without permission of a popular plebiscite [Ilya Shapiro and Julio Colomba, Cato, SCOTUSBlog, earlier]
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Ummm, didn’t California do this with Proposition 13 many years ago restricting property tax increases? And it was upheld by the Supreme Court:
http://en.wikipedia.org/wiki/California_Proposition_13_%281978%29