RENO -- Democrat Jack Carter faces an uphill battle if he hopes to unseat Republican incumbent John Ensign in Nevada's U.S. Senate race, according to a new poll. "There is a better chance that Jimmy Carter will be elected president than Jack Carter has to be elected to the U.S. Senate," said Pete Ernaut of Reno, president of public affairs for R & R Partners, a former Republican assemblyman and former chief of staff for Gov. Kenny Guinn."