What, Republicans aren't allowed to sign petitions?
From the Times Record:
Democrats have argued that the Republican Party of Arkansas was behind the Nader petitions because several signatures were of well-known Republicans. They argued that Arkansas is a battleground state in a close presidential race, and Republicans want Nader on the ballot to pull votes from the Democratic presidential nominee, John Kerry.
So? Is there any state law that voids signatures if they're signed by Republicans?
For now, Nader's back on in Arkansas.