In 1983 Petak was elected to the Racine Unified School Board. He was re-elected in 1986 and 1989. In 1990, he was elected to the Wisconsin State Senate, defeating the incumbent Senate Majority Leader Joseph A. Strohl. Petak successfully exploited controversy that had emerged over Strohl's opposition to a parental consent law for minor girls seeking an abortion. Petak won re-election in 1994, but ran into controversy in October 1995, when he changed his vote on a funding bill for the Miller Park stadium. Miller Park was being planned to replace the forty-year-old Milwaukee County Stadium and was being pushed by RepublicanGovernorTommy Thompson and Milwaukee Brewers owner and future-Commissioner of Baseball, Bud Selig. Petak had promised his constituents that he would vote against the bill, but changed his mind based on the belief that the Brewers would leave Wisconsin if a new stadium wasn't built. Petak's deciding vote supported a 0.1 percent sales tax increase for the five counties in the proposed stadium's vicinity, including Petak's home county, Racine. Petak faced immediate outrage in his home district, and local Democrats were energized to collect signatures for a recall petition. The petition was certified on March 26, 1996, and a recall election was ordered for June. Nine months after his vote on the stadium tax, Petak became the first Wisconsin state legislator to be removed from office in a recall election, when he was defeated by Democratic State Representative Kimberly Plache. A few weeks after his election loss, Petak was appointed deputy director of the Wisconsin Housing and Economic Development Authority, a quasi-public agency established by the Wisconsin Legislature, where one third of the Board of Directors are Wisconsin legislators. Petak had served on WHEDA's board of directors for six years and had oversight of WHEDA while he was Chairman of the Senate Business, Economic Development and Urban Affairs Committee. The appointment was criticized at the time as a political favor for a former senator who lost his seat over a controversial vote. Petak briefly flirted with a run for Congress in 1998, after 1st Congressional District incumbent Mark Neumann decided to run for U.S. Senate instead of seeking re-election. Petak ultimately chose not to run and accused his would-be Republican primary opponent, future-Speaker of the U.S. House of RepresentativesPaul Ryan, of exploiting the stadium tax controversy. Petak instead went into government affairs consulting in Madison, Wisconsin and started his own consulting business in 2009. As of 2016, Petak returned to the Wisconsin Housing and Economic Development Authority as Senior Business and Community Engagement Officer.
