The Obama administration on Monday announced that 5 million people had signed up for Obamacare exchange plans. Hours earlier, a self-employed Web developer from Michigan had already predicted the milestone would be hit on Monday. Meet Charles Gaba: He's not a professional statistician, heath-care expert or political operative. He's a self-described ?numbers geek? who just wants to know how the new health-care law is doing. He's been tracking the most up-to-date enrollment information and offering his own projections on his blog, ACAsignups.net. On the same day that he predicted the 5 million signups milestone, he accurately predicted that California would hit the 1 million mark.