Federal investigators recently made covert tape recordings of Gov. Rod Blagojevich in the most dramatic step yet in their corruption investigation of him and his administration, the Tribune has learned. As part of this undercover effort, one of the governor's closest confidants and former aides cooperated with investigators, and that assistance helped lead to recordings of the governor and others, sources said. The cooperation of John Wyma, 42, one of the state's most influential lobbyists, is the most stunning evidence yet that Blagojevich's once-tight inner circle appears to be collapsing under the pressure of myriad pay-to-play inquiries. Wyma, Blagojevich's chief...