Hamtramck, Michigan (CNN)For decades, Hamtramck was known as Michigan's "Little Warsaw," a city of just two square miles of tightly-packed houses and factories, spitting distance from downtown Detroit. The Polish Cardinal Karol Wojtyla visited once, back in 1969, before he became Pope. A statue of Wojtyla, arms outstretched, still casts a shadow over what's now called Pope Park, where a huge mural of Polish folk dancers stretches almost an entire city block. In the 99 years since its incorporation, every mayor of Hamtramck has been Polish American. That ends January 2....