Famously reclusive, this radio station owner is the power behind several progressive causes. His backing made same-sex marriage a reality in Illinois, and he remains the top donor to the AIDS Foundation of Chicago. Last year, he was the third-largest donor ($5 million) to the Senate Democrats. That didn’t work out so well, but Eychaner may be ready to pony up more to give them a shot at reclaiming the upper chamber in 2016.