Vote analysis: GOP not key in McKinney loss to Majette

According to the Atlanta Journal-Consitution, no more than 3,118 of the voters in the Democratic primary vote between Denise Majette and Cynthia McKinney were Republicans. Majette won by something like six times that... McKinney's supporters, meanwhile, claim that 37,500 Republicans voted in the election. Which makes no sense, as you might expect. That's more than half the votes; what they're saying is essentially that everyone who voted for Majette is a Republican. If there were that many Republican voters in the district, then winning the Democratic nomination wouldn't be tantamount to election, would it?