MADISON — Wisconsin's leading business lobbying group announced Friday that a $2 million television ad buy supporting Republican Gov. Scott Walker would hit the air statewide Monday, a little over a week before Democrats will vote for who should take him on in a recall election.

The purchase by Wisconsin Manufacturers and Commerce is another sign that the ad wars are heating up before the May 8 primary. A labor-sponsored group announced Thursday it was starting a $1 million ad buy in support of Democrat Kathleen Falk.

Both Falk and Milwaukee Mayor Tom Barrett released their latest campaign fundraising totals Friday in advance of a Monday reporting deadline.

Falk said she raised $1 million from the beginning of the year through Monday, while Barrett, who got into the race on March 30, said he raised $750,000 in just 25 days. Neither of them released how much cash they had on hand. Barrett entered the race with about $480,000.

Secretary of State Doug La Follette and state Sen. Kathleen Vinehout are also running as Democrats. And Gladys Huber is a Republican who's running as a Democrat.