A Republican candidate for Illinois governor has contributed another $500,000 to his campaign.
Winnetka venture capitalist Bruce Rauner has now pumped $1.25 million of his own money into the four-way GOP primary for the right to take on Democratic Gov. Pat Quinn in 2014.
Rauner filed petition signatures for a ballot position Monday and also released three years of tax returns. They show he reported more than $53 million in income last year.
He also disclosed ownership stakes in three professional sports franchises, including the Chicago Bulls.
He reported making $28.1 million in 2011 and $27.1 million in 2010.
In a statement, Rauner says he's worked "extremely hard" and feels "incredibly blessed to have earned financial success."
Rauner says if elected he'll put his holdings in a blind trust.
His Republican opponents say they aren't concerned about being outspent in the primary race to take on Democratic Quinn next fall.
State Sen. Kirk Dillard says he doesn't begrudge Rauner his wealth. Rauner reported a 2012 income of $53 million. But Dillard says Rauner is a "RIMO": a "Republican in Money Only" because of a long association with Democrats.
Sen. Bill Brady says he'll raise enough money to have a "credible campaign" and Treasurer Dan Rutherford says he's a proven statewide candidate who can win.