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Madison -- Gov. Scott Walker took in six contributions above the normal $10,000 limit during a recent four-week period, including one from the richest woman in the world, according to a newly filed report.

Christy Walton, a Walmart heiress active in the school voucher movement, gave Walker $50,000, the report shows. Forbes lists Walton as the richest woman in the world, with a net worth of $25.3 billion.

The other donations above the usual limit were: $25,000 from Grant E. Nelson of Prescott, Wis., who heads a large foundation; $25,000 from Richard Uihlein, CEO of Illinois packaging company Uline; $25,000 from Fred Fehsenfeld, chairman of the executive committee for the Heritage Group in Indianapolis; $25,000 from Robert McNair, CEO of the Houston Texans football team; and $20,000 from Gary Reynolds, CEO of GMR Marketing of Delafield.

Normally, donors can give a maximum of $10,000 to a candidate for governor. But donors can give any amount to defray expenses incurred from the time recall petitions are taken out to the time a recall election is called.

For Walker, that period ran for 4 1/2 months, from Nov. 15 to March 30, and his latest large contributions can be used toward expenses from then.

Walker's Democratic opponent in Tuesday's recall election, Milwaukee Mayor Tom Barrett, has had to comply with the normal limits throughout the campaign.