Courtesy of Drew Griffin at CNN:

According to the Taxpayers Union research, 20 lawmakers over the last 25 years have been found guilty of serious crimes while in office. All 20 received, or are still receiving, congressional retirement benefits.

The focus of Griffin's post is Chicago's own Dan Rostenkowski, convicted on charges of corruption stemming from the 1994 House post office scandal and subsequently pardoned by Bill Clinton after serving more than a year in the pen. Rosty is still collecting a cool $126,000 per year pension, courtesy of U.S. taxpayers.