A new website that predicts congressional bills' success foresaw the Affordable Care Act replacement bill would be shelved instead of passed – awarding it only a 15 percent chance of being enacted. Users can look up any pending bill on PredictGov or find predictions through its partner, legislation tracker GovTrack, which now includes a "prognosis" line in its overview of each bill. Vanderbilt University law Professor J.B. Ruhl is a co-founder in bill forecasting site PredictGov. PredictGov, which uses big data and artificial intelligence to reach its conclusions, is the invention of Vanderbilt University law Professor J.B. Ruhl; computer scientist and doctoral candidate John Nay, and their team. It pulls from decades of congressional data plus hundreds of variables, including the bill's sponsor, amendments, economic trends and political shifts.