Some say U.S. senator should focus on emphasizing his conservative record. BY BEN SZOBODY The shouts of "traitor" that rained on Republican U.S. Sen. Lindsey Graham last week at a local town hall meeting revealed rifts among conservatives that some analysts say might signal trouble for center-right politicians such as Graham. Political experts say a burgeoning group of right-wing activists long seen as the fringe of the party is growing in influence, fueled by economic fears and populist ire over unchecked Washington spending and magnified by the power of the Internet. Whether they represent a vocal minority or the seeds...