===Ties to Scott Walker and Dark Money Groups Under Investigation===
[[Image:RColburn_contribution_John_Doe_docs.png|right|thumb|450px|Summary of supporting exhibits from [https://www.sourcewatch.org/images/7/71/Francis_Schmitz_Supplemental_Opp%E2%80%99n_to_Pl.%E2%80%99s._Mot._For_Prelim._Inj.%2C_O%E2%80%99Keefe_v._Schmitz%2C_Filed_Feb._15%2C_2014..pdf case documents] filed August 22, 2014.]]
In addition to a $10,000 contribution he reported making to the recall campaign of Wisconsin Governor [[Scott Walker]] on May 7, 2012,<ref name="wisdc contributions"/> Colburn also made an undisclosed contribution of $50,000 on the same day to [[Wisconsin Club for Growth]] (WiCFG), a Wisconsin-based organization that spent at least $9.1 million during the recall elections, and funneled at least $10 million more to other politically-active groups like Wisconsin Manufacturers & Commerce, while reporting that it spent $0 on politics to the IRS.<ref> Brendan Fischer, [httphttps://www.prwatch.org/news/2015/04/12816/scott-walker-GOP-prosecutor-john-doe GOP Prosecutor Defends Scott Walker Criminal Probe, Says "Let's Get the Truth Out"], ''PR Watch'', May 1, 2015.</ref> The contribution only became public in August 2014, when documents related to a "John Doe" investigation into potentially illegal campaign coordination between Walker's campaign, WiCFG, WMC, and possibly other groups were briefly unsealed. According to the ''Milwaukee Journal Sentinel'', the documents suggest that Walker was advised to personally solicit funds from Colburn and others for WiCFG:
:"The records include example after example of Walker or his aides encouraging donors to give money to the Wisconsin Club for Growth.