Although Massachusetts Sen. John Kerry has already clinched the Democratic nomination, half the Tar Heel caucus-goers voted for Edwards, the favorite son who dropped out of the presidential race last month. Some Democrats said their vote was meant to be a political telegram to Kerry's Boston headquarters: Choose Edwards to be your vice presidential running mate. "I want to send a message to the rest of the party that we need Edwards on the ticket," said Micky Mills, 42, of Apex, who works for a cleaning company. "That North Carolina is strongly behind John Edwards. If we put him on...