U.S. Senate hopeful Jamie Radtke has hit the airwaves.

Radtke, who is in an uphill battle for the Republican nomination for U.S. Senate, has begin airing ads attacking rival George Allen.

The tea party activist has been by far the most outspoken against Allen, trying to label him a big spender who did not challenge the status quo during a previous term in the U.S. Senate.

“George Allen is a risky choice and an election disaster waiting to happen,’’ the narrator says. “And this is one election we can’t afford to lose.’’

Radtke said the ad, running statewide during morning commutes and on the shows of conservative hosts Rush Limbaugh, Sean Hannity and Glenn Beck, will air through the June 12 primary.

Bishop E.W. Jackson and Del. Robert G. Marshall (R-Prince William) are also vying for the GOP nomination. The four will meet for their final debate Friday in Northern Virginia.

A Washington Post poll released recently showed Allen with 62 percent of the vote among likely GOP primary voters. Marshall was next with 12 percent, and Radtke and Jackson had 5 and 3 percent, respectively.

The winner of the primary will compete in the general election against former governor Timothy M. Kaine, who faces no opposition for the Democratic nomination. The race, to fill the seat being vacated by retiring Sen. James Webb (D), is expected to help determine the balance of power in the U.S. Senate.

“Our campaign is focused on the real fight ahead of defeating Tim Kaine and his policies of higher taxes, more regulations and bigger government,’’ Allen spokeswoman Emily Davis said. “We’re encouraged by the vast grassroots support George Allen is receiving for his positive, pro-growth solutions to free our economy and create jobs.”