Former Montana Gov. Brian Schweitzer's connections to two secretive political nonprofit groups runs much deeper than the would-be Senate candidate let-on in July 2013. While Schweitzer was at the helm of the Democratic Governor's Association, that group funneled more than $300,000 to a Helena-based non-profit run by Schweitzer's appointee to head the state's Office of Political Practices. From there the money ended up in the bank account of a mysterious Washington, D.C.-based political non-profit. What that group spent the money on is still a mystery. Schweitzer, an outspoken critic of the influence of "dark money" on Montana politics, deflected questions about his involvement with the organizations. A top aide to Schweitzer's said a common post office box was the only connection between the former governor and the two groups. A Tribune investigation found that Schweitzer ties to the people and organizations involved in the mysterious organizations ran much deeper than a shared address.