ROBERT SIEGEL, HOST:
From the presidential contest, now to one of the tightest Senate races in the country. It's in Nevada where early voting begins this Saturday. The GOP's hopes of capturing a majority in the Senate depends in part on their Nevada candidate, Dean Heller. He is the incumbent in the race. The former three-term congressman was appointed to finish the term of Republican Senator John Ensign, who resigned because of a sex scandal.
NPR's Ina Jaffe reports that Heller's Democratic opponent has made this a remarkably close race, even though she is the subject of an ethics probe.
INA JAFFE, BYLINE: Seven-term Congresswoman Shelley Berkley is being investigated for her efforts to save southern Nevada's only kidney transplant program, just the sort of thing a member of Congress would do for her district. But it turns out that Berkley's husband is a kidney specialist whose business profits from the program.
UNIDENTIFIED MAN 1: And now, Ralston reports. Welcome back across Nevada...
JAFFE: Veteran political reporter Jon Ralston was the moderator of the final debate between Berkley and Heller this week. And the congresswoman said she had no doubt she'd ultimately be exonerated.
REPRESENTATIVE SHELLEY BERKLEY: I did absolutely nothing other than what is important to the people that I represent, making sure that they get the best possible health care in this country and in this state.
JAFFE: Dean Heller worked with Berkley to save the kidney transplant program, but he told moderator Jon Ralston he didn't know at the time that Berkley's husband was a kidney doctor.
SENATOR DEAN HELLER: And she never brought it to my attention, either.
BERKLEY: Wait a minute.
HELLER: And I wish she had, actually.
BERKLEY: Why? Would you have voted against it?
HELLER: We probably would have had a different discussion.
JON RALSTON: What would the discussion have been?
HELLER: That perhaps you ought to be a little bit more careful if she, in fact, did have a conflict.
BERKLEY: Oh, thank you very much for giving me that sage advice.
JAFFE: Hard to say why the ongoing ethics investigation hasn't hurt Berkley more.
DAVID DAMORE: I think the Heller campaign thought they would've put her away by now.
JAFFE: David Damore teaches political science at the University of Nevada, Las Vegas.
DAMORE: The fact that she's been able to sort of survive this and still be within the margin of error in most of the polling I think tells you that either voters have a really low level of expectation for their politicians or that she's done a pretty good job of spinning the story.
JAFFE: Berkley also has the numbers on her side. Democrats now have about an 8-point registration advantage over Republicans, which is why Heller has been pitching hard to independents, who make up nearly 18 percent of Nevada voters.
HELLER: Used to be a time when a good idea was a good idea, and it didn't matter whose idea it was. I support Democrat and Republican ideas when they're good for Nevada.
JAFFE: Heller has even put some daylight between himself and the man at the top of the GOP ticket, says David Damore.
DAMORE: For example, after the 47 percent dust-up a few weeks ago, he was very quick to point out how members of his family had used government services and he didn't take that point of view. When Romney came in for a rally in southern Nevada, Heller was nowhere to be found.
JAFFE: But that hasn't stopped Shelley Berkley from trying to paint Heller as a knee-jerk GOP loyalist.
UNIDENTIFIED MAN 2: Dean Heller's running ads saying he's independent? It's Heller who's voted with Republicans 91 percent of the time.
JAFFE: Nevadans can hear these attacks and more 24 hours a day, seven days a week. All they have to do is turn on the TV. Las Vegas is one of the most saturated media markets in the country when it comes to political advertising. The Senate campaigns are just a part of that. There are also the presidential campaigns and a couple of hard-fought congressional races.
And then there are the outside groups. For example, Karl Rove's Crossroads GPS has spent $3 million attacking Berkley in just the last couple of months.
UNIDENTIFIED MAN 3: Shelley Berkley, big tax hikes, big job losses, a big mistake for Nevada. Crossroads GPS is responsible for the content of this advertising.
JAFFE: And Crossroads just announced they're going to spend another million dollars against Berkley in the coming week. But with the piles of money being spent on TV advertising here, most polls continue to show the Senate race is a dead heat. And the only Nevadans who aren't tired of this show probably own TV stations.
Ina Jaffe, NPR News, Las Vegas.