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Madison -- Gov. Scott Walker raised an unprecedented $13 million since mid-January -- an unheard of figure in races for governor.

The money he has raised in the last three months is more than the $12 million he raised in 2011, which was itself a record at the time.

The latest donations were raised between Jan. 18 and April 23, and a report on his fundraising is due later Monday in the run-up to his June 5 recall period.

His fundraising dwarfs what his chief Democratic rivals have raised this year. So far this year, Dane County Executive Kathleen Falk raised $1 million and Milwaukee Mayor Tom Barrett raised $750,000.

The Democratic primary is May 8.

Lt. Gov. Rebecca Kleefisch raised more than $540,000, according to her campaign.

The candidates have released their bottom-line numbers, but not their full reports that show who their indvidual donors were. The full reports are to be filed later Monday.