By MIKE BAKER, Associated Press Writer1 hour, 39 minutes ago U.S. Rep. Brad Miller (news, bio, voting record) chuckled through most of the first debate with his Republican challenger, who led a tense and often awkward discussion about sex-related issues Tuesday. Vernon Robinson, who has run a series of brash advertisements about the two-term Democratic congressman, charged that Miller wants to import homosexuals to the United States and supported scientific studies that would pay teenage girls to watch pornography. "Those are San Francisco values, not North Carolina values," said Robinson, repeating a common theme of his campaign. A bemused Miller...