From 2001 to 2006, bills proposing adoption of the district system were introduced in many states, but failed to pass, according to the NCSL website.

CNN: Some GOP-led states look at electoral vote changes

Twenty-nine states have constitutional provisions banning same-sex marriage, the NCSL says.

CNN: STORY HIGHLIGHTS

That has supporters, including the NRF, the SSTGB and the National Conference of State Legislatures (NCSL), mulling over how to revamp two bills, both called the "Sales Tax Fairness and Simplification Act, " which have been pending in the House and the Senate since 2007.

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