Senate Majority Leader Harry Reid (D-Nev.) on Monday levied fierce criticism at Sen. John McCain, accusing him of playing petty politics, being stuck in the 2008 presidential campaign season and refusing to do "good things for the country."

Reid, doing a victory lap after President Barack Obama proposed to kill funding for the Yucca Mountain project in Nevada, was asked on a Las Vegas political talk show about McCain's criticism of Democrats' stand against the nuclear waste dump.

"Well John is a great name-caller," Reid told host Jon Ralston on the show "Face to Face." "The election is over. He should leave Barack Obama alone and join with us to do good things for the country."

Reid then twisted the knife further, saying that McCain "has no reason to be the way he is but he's become very, very -- kind of opposed to everything.

"I'm very disappointed in how he's reacted [after the 2008 election]," Reid added. "You know we've had some people who've run for office [and] lost, who've come back and been great statesmen. John Kerry is one example, Al Gore is another, Jimmy Carter. I just think he's got to get over this and move onto something else."

A McCain spokeswoman declined to comment. McCain has repeatedly accused the president and Democratic leadership for failing to engage in genuine bipartisan talks and for instead pursuing a partisan agenda.

Reid also dispelled any rumors that he may call it quits before his reelection bid this November, saying that he's put together an unprecedented campaign operation in the state and that he'll be on the ballot in the fall despite his sagging poll numbers.

"I have, I think, the best campaign organization that's ever been set up in the state of Nevada," Reid said. "I have key people that are running this campaign. I feel very comfortable where I am at this time."

Pressed by Ralston if he was definitely in the race, Reid said: "I'm running."

Reid has turned up his criticism on McCain in recent weeks, saying in an interview published last month in The New York Times that he's been startled by the Arizona Republican's demeanor since the end of the 2008 presidential campaign.

"My disappointment -- no, that's the wrong word; I'll try to find a better word," he said. "My amazement has been John McCain. I thought he'd turn out to be a statesman, work for things. He's against everything. He's against everything! He didn't used to be against everything."

And right before the 2008 election, Reid told the Las Vegas Review Journal, "I can't stand John McCain."

Reid walked back those 2008 comments over McCain right after the election, but it's not clear that the two men have worked closely together this Congress.

Reid's comments could be used to his political advantage as well. He is a fierce opponent of the Yucca Mountain facility, located 100 miles northwest of Las Vegas, which McCain supports. And one potential Reid challenger -- Lt. Gov Brian Krolicki -- supported McCain's presidential bid, and McCain has urged Krolicki to consider jumping into the GOP primary.

McCain, himself facing a conservative primary challenger in his Senate race this year, sharply criticized the White House's budget proposal Monday to eliminate funding for the Yucca dump and move forward with a blue-ribbon panel to recommend ways to deal with nuclear waste at power plants.

"It's really an insult to one's intelligence when you take [Yucca] and recycling off the table, and then try to create the impression you're serious about nuclear as a viable option," McCain told the Wall Street Journal. If the blue-ribbon panel doesn't consider Yucca Mountain as an option, McCain said, "then their recommendations will lack significant credibility."

Conversely, Reid has taken pride in leading a crusade to shut down Yucca -- an issue he has touted in campaign ads back home -- and he took credit Monday for the president's decision to eliminate funding in his newly proposed budget.

"I've worked on this since I came to Washington more than two decades ago. If someone had suggested, just a few years ago -- 10 years ago, five years ago, three years ago, two years ago -- that we would be in this position, people would have said that's impossible," Reid said Monday on the talk show. "But I think we've done the impossible.

"I've worked very hard on this for a long time, and I think I can take a little credit for killing Yucca Mountain."

Asked if this was truly the end of the long-standing project, Reid added: "You have a person that's dead, they've been run over by a car and they dropped a whole building on them, and you're still asking if the person is dead? Yucca Mountain is dead."