Sitting Gov. Scott Walker will try to keep his job Tuesday as Wisconsinites head to the polls in an historic recall election, one that has seen more than $63 million poured into the state. Thanks to a century-old ban on independent expenditures by corporations and unions, more money has been spent on the recall than any other election before it, including the 2010 governor’s race, which saw a mere $37.4 million in campaign spending. Milwaukee Mayor Tom Barrett, Walker’s Democratic challenger, has received 26 percent of his $4 million from out of state. Walker, meanwhile, has collected around 65 percent of his $30.5 million from beyond Badger State borders. Barrett entered the race in late March.