Former governor and senator George Allen raised more than $1.5 million in the first three months of this year in the race for the Republican nomination for U.S. Senate in 2012, his campaign announced Tuesday.

Allen received money from donors in every county in the state, averaging more than $150,000 a week in contributions. The campaign ended the quarter with nearly $1.25 million in the bank.

“Susan and I are encouraged and humbled by the generosity of our supporters. It is truly invigorating to see the enthusiasm and momentum build throughout Virginia,” Allen said in a statement. “I look forward to continuing to build a strong team of grassroots supporters who will work to bring the voices and values of Virginians to Washington.”

Jamie Radtke, former chairwoman of the Virginia Tea Party Patriots Federation, has not released her fundraising numbers, which are due Friday.

Her spokesman Chuck Hansen said Radtke exceeded her two goals this quarter: to put together a solid campaign organization and raise $50,000.

“We always knew this would be a grassroots versus establishment race; the establishment money comes early, the grassroots and tea party money will be there when it matters,’’ he said.

Radtke raised about $100,000 in the three weeks that ended Dec. 31.

“Keep in mind that, at this time in 2005, the Allen campaign had raised more than $2,000,000 and had more than $3,000,000 in the bank,’’ Hansen said. “One year later, Allen had more than $7,000,000 in the bank and Jim Webb had raised less than we already have raised. How’d that turn out?”

Several other Republicans are running, including Hampton Roads lawyer David McCormick and Chesapeake Bishop E.W. Jackson. Other potential GOP candidates include Del. Robert G. Marshall (Prince William), Prince William Board of County Supervisors Chairman Corey A. Stewart, businessman Bert Mizusawa and wealthy television production company owner Timothy E. Donner.

On the Democratic side, former Gov. Timothy M. Kaine, who resigned last week as Democratic National Committee chairman to run for U.S. Senate, got into the race recently and will not be required to report numbers until next quarter.