A group of Senate Democrats sent a letter Monday to Commodity Futures Trading Commission (CFTC) Chair Michael Selig, urging him to clarify his position on prediction markets. Democratic Sens. Richard Blumenthal (Conn.), Cory Booker (N.J.), Catherine Cortez Masto (Nev.), Tim Kaine (Va.), Jacky Rosen (Nev.) and Adam Schiff (Calif.) outlined their concerns to the CFTC...