It's on in Wisconsin.

On Tuesday afternoon, the grassroots group United Wisconsin collected more than a million signatures in the past two months to trigger a recall election of Republican Gov. Scott Walker—nearly twice the 540,208 minimum. That's almost as many signatures as votes Walker received in his 2010 gubernatorial election (1.12 million), and hundreds of thousands more than the 720,000 signatures Walker predicted on Rush Limbaugh's show Tuesday. Democrats also said 845,000 signatures had been collected to recall Walker's right-hand woman, Lt. Gov. Rebecca Kleefisch. Additionally, enough signatures were bagged to recall GOP state senators Pam Galloway, Terry Moulton, and Van Wangaard.

The Walker and Kleefisch recall efforts were spearheaded by the grassroots group United Wisconsin, which signed up more than 30,000 volunteers to canvass all of the state's 72 counties. United Wisconsin launched the recall campaign at midnight on November 15, and had 60 days to gather enough signatures to recall the governor and his lieutenant. Accounting for the signature-vetting process and legal challenges, the recall elections for Walker and Kleefisch are likely to take place in late April or May.

The signatures must still be reviewed by the state's Government Accountability Board and could also face legal challenges by lawyers for state Republicans...

But Walker recall organizers say the staggering number of signatures amounts to a mandate to get Walker and Kleefisch out of office. "The collection of more than one million signatures represents a crystal clear indication of how strong the appetite is to stop the damage and turmoil that Scott Walker has caused Wisconsin," said Ryan Lawler, an official with United Wisconsin.