With six days to Florida's primary, Democratic Rep. Kendrick Meek is pulling out the big guns in his tough battle for the U.S. Senate nomination against new-comer Jeff Greene, a billionaire real estate mogul who made his fortune betting home mortgages would fail and has spent millions on TV ads against Meek.

"He is definitely trying to buy the election. You know more commercials, misleading commercials, phone calls, mailers," Meek said.

The latest Quinnipiac poll shows Meek inching into a slim lead, 35 percent to 28 percent over Greene in a very volatile race. Sixty-eight percent of Democrats say they're either undecided or may change their minds. Greene joined the race convinced Meek could be toppled and the newcomer has pulled within striking distance of an upset.

"I was at 2 percent, then 12 percent," Greene said. "Right now, it's competitive."

But Meek has presidential power on his side.

On Wednesday, President Obama came to raise money and support for Meek. On Tuesday, Florida's respected former senator, governor and presidential candidate Bob Graham stumped for Meek. And on Monday, Bill Clinton echoed complaints about Greene's inexperience and self-funded attack ads.

"Near as I can see, that's the difference," Clinton said. "One guy's delivering for you and the other guy has more money and runs more ads."

But Meek, a four-term congressman, whose mother once held the seat, sees a bigger difference: morals.

"I have always said that Greene is a bad man, and you know that's the only way I can put it because a lot of this stuff that he is known for is not good for people under 18," Meek said.

Florida media has been in an NC-17 feeding frenzy over Greene's personal life. Newspapers, airwaves and blogs are carrying purported first-hand accounts of sex and drug parties on Greene's yacht before his marriage in 2007.

Mike Tyson, who was the best man at Greene's wedding, told reporters he never used drugs on the yacht. Greene's threatening to sue at least one Florida newspaper for libel over coverage of his business practices and insists there is no truth to allegations of naked drug parties in his private life.

"Look, did I have parties on the yacht? We had parties," he said. "Did we have parties like they are describing? Absolutely not. And there is no pictures. That is what I'm saying. There were never any pictures of anything."

But a number of people are telling tales and a former yacht staffer has even begun releasing photos. Whoever wins the Democratic primary still faces a tough general election race against Charlie Crist, Florida's governor who's running for Senate as an independent, and Republican nominee Marco Rubio.