On Oct. 23, Las Vegas casino mogul Sheldon Adelson gave the Republican Party of Wisconsin $650,000. That same day, the Republican Party of Wisconsin gave Walker an in-kind contribution of a little more than $450,000.

While Adelson has previously donated to Walker, this was his first contribution to the state party. He gave Walker $250,000 during his 2012 recall election, taking advantage of the fact that the subject of a recall isn't held to the usual $10,000 limit for individual contributions.

"Half of the $80 million Scott Walker's raised comes from outside of Wisconsin, and we all remember when he when flew to Las Vegas, hat in hand, to beg Sheldon Adelson for his support," said Scot Ross, executive director of the liberal advocacy group One Wisconsin Now. "What are the odds that the same day Las Vegas billionaire casino magnate Sheldon Adelson gives for the first time in his 80-plus years to the Republican Party of Wisconsin to the tune of more than $450,000, the same day the party gives Scott Walker more than $450,000?"