OK, I'm turning into a bit of a spammer on this issue, but... Here's some discussion of PAL representation's legality in the US<http://wiki.electorama.com/wiki/PAL_representation#Note_on_legality_in_US>. A state could pass a law to use FMV (a true proportional system) until the anti-PR federal law is repealed, then automatically switch to PAL representation (an easy and smooth transition; FMV was a major inspiration for PAL). Basically, I think it's an important fact that FMV is the only known proportional system *compatible with current US federal law*. (There are no US constitutional barriers to PR, just federal law).
Jameson Quinn
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