(CNN) - A new poll of Nevada voters suggests that Senator John Ensign's favorable rating among people in his home state is plunging since he admitted to an extramarital affair.
Thirty-nine percent of people questioned in a Las Vegas Review-Journal survey conducted by Mason Dixon Polling and Research Inc. have a positive view of Ensign. That's down 14 points from a month ago. Thirty-seven percent say they regard Ensign unfavorably, up 19 points from May.
But the poll suggests that 62 percent do not think Ensign should resign from the Senate over his admission of infidelity, with 29 percent saying he should step down.
The poll was conducted Thursday and Friday. On Tuesday Ensign announced the nine month long affair with a married campaign staffer. The senator says he and his wife have reconciled.
Ensign is not up for re-election until 2012.
"His numbers have obviously dropped. He's obviously suffered damage because of this," says Mason-Dixon Managing Partner Brad Coker says in the Las Vegas Review Journal. "But it could be a lot worse for Ensign. The really significant question is that only 29 percent think he should resign right away. He does have the ability to stay on and turn this around."
The survey indicates that only 17 percent of Republicans want Ensign to step down. That number jumps to 40 percent among Democrats. One in four men think Ensign should resign. That rises to one in three women.
The two-term senator was considered a rising star within the Republican party. Earlier this month he spoke to a conservative group in Iowa, sparking speculation that he was considering a stab at the 2012 GOP presidential nomination. A day after admitting to an extramarital affair, Ensign resigned his position as head of the Republican Policy Committee, the fourth-ranking elected leadership position among Senate Republicans.
The poll suggests that even after dropping 14 points, Ensign's favorable rating is slightly higher than that of Nevada's senior senator, Democrat Harry Reid. Thirty-four percent of those questioned in the survey had a favorable view of the Senate Majority Leader. Only one in ten had a positive view of the state's extremely unpopular governor, Republican Jim Gibbons.
The Mason-Dixon Polling and Research Inc. survey was conducted Thursday and Friday, with 625 Nevada voters questioned by telephone. The poll's sampling error is plus or minus four percentage points.