Sen. Minority Leader Harry Reid on Thursday slammed the respected RealClearPolitics website, which says a Republican is likely to replace Reid in the Senate next year.

Reid, D-Nev., told a reporter for the aggregate and news site that RCP did not accurately assess the state of the Senate race in Nevada, where Republican Rep. Joe Heck is running against Catherine Cortez Masto, a Democrat.

The RealClear Politics average shows Heck leading Masto by more than three points, an advantage he has held for months. But Reid called the polling "bad" after an RCP reporter asked about the state of the race.

"I don't want to let any of the air out of your balloon, buddy, but RealClear Politics is one of the worst." Reid said the site uses inaccurate polls.

"All of them are wrong," Reid said. "Rather than doing your own stuff, all you do is average out all these bad polls."

Reid said he is confident Cortez Masto will win the state.

"Catherine is going to win by a nice margin," Reid said. "RealClear Politics is totally unimpressive to me."

Nevada polling has included some of the nation's most respected firms, including Hart Research and Suffolk and Las Vegas Universities, Emerson College and Fox News.