Burke campaign spokesman Joe Zepecki said she had not contributed any of her own money between January and June of this year.

“Due to the overwhelming support Mary has received, there has been no need for additional contributions to this point,” Zepecki said. “As she has said all along, she is committed to doing more and will do more before the race is over.”

Burke has raised $ 5.4 mil lion since she launched her gubernatorial bid last fall, including about $400,000 she contributed to her campaign.

But the Walker campaign said the numbers showing his campaign fundraising is dwarfing his likely opponent’s campaign coffers indicate the momentum in the race is behind him.

“The $5 million gap in cash on hand shows the extraordinary enthusiasm behind Gov. Walker’s campaign to continue moving Wisconsin forward,” Walker campaign manager Stephan Thompson said.

And Joe Fadness, executive director of the Republican Party of Wisconsin, said her lack of personal spending in the race spelled trouble for her.