Sen. John McCain took no chances in his primary fight with former Rep. J.D. Hayworth, a talk radio host mounting a challenge from the right against the 2008 Republican presidential candidate.
McCain spent $21 million on the primary, a staggering sum for a candidate who was his party's nominee for president just two years ago, but the seriousness with which McCain took the primary, altering some of his more independent positions to appeal to a conservative base, helped him handily defeat Hayworth.
"This was a tough, hard-fought primary," McCain said in his victory speech. "I promise you, I take nothing for granted and will fight with every ounce of strength and conviction I possess to make the case for my continued service in the Senate."
McCain, who has never lost a statewide race, is the odds-on favorite to win a fifth term come November.
In Florida, a Democratic billionaire stumbled in his quest to become a senator and a Republican multi-millionaire scored an upset in his quest for the Republican nomination to governor, making make it a mixed night for uber rich candidates there.
Rick Scott, the multi-millionaire former hospital chain executive, had trailed in recent polling, but defeated Florida Attorney General Bill McCollum 46-43 after a campaign that turned ugly in recent weeks.
In the other hotly contested and nationally scrutinized Florida race, Jeff Greene, the insurgent billionaire who poured tens of millions of his own money into the Democratic primary was unable to defeat Rep. Kendrick Meek, a South Florida lawmaker with a political pedigree. Meek got more than 57 percent of the vote.
"The pundits thought this seat could be bought," Meek said in a message to supporters. "Our critics wrote us off."
Meek will face off against Republican Marco Rubio, the tea party favorite and former State House speaker, whose strong conservative candidacy drove moderate Gov. Charlie Crist out of the Republican party earlier this year when his public backing of President Obama's economic policies made him unpalatable to Florida Republicans.
Rubio faced only token opposition in the Republican primary.
But Crist has stayed in the Senate race as an independent, setting up a three-way contest in November.
Despite campaign help for Meek from former President Bill Clinton and President Obama, some Washington Democrats had secretly been hoping for Greene to pull out a victory because it would have helped Crist, who they hope could help them maintain their majority in the Senate.
Recent polling shows Rubio and Crist neck and neck, with Meek drawing between 15 and 20 percent of votes in a hypothetical general election.
"While Meek is an unabashed liberal, Gov. Charlie Crist has made it clear that he will simply say or do anything to win an election, as his positions seem to move wherever the most politically expedient wind blows," said Sen. John Cornyn, R-Texas, who chairs the National Republican Senatorial Committeee in a memo previewing their argument for Rubio leading into the fall.
Greene's brief candidacy provided salacious story lines; he brought a big personality into the race and was dogged by, among other things, his personal friendship with the former boxer Mike Tyson, who was the best man at Greene's wedding, and his former roommate Heidi Fleiss, notorious as the Hollywood Madame.