By Tobias Carroll The guests on the current season of Real Time With Bill Maher have been an ideologically diverse bunch, representing a host of worldviews from the left, right and center. But there’s been one phenomenon that’s come up again and again over the last few weeks: one of Maher’s guests taking a moment to thank him for creating a space for wide-ranging political discourse on the air. That was indeed the case this week, with Katrina vanden Heuvel as the latest to make that argument. The latest episode of Real Time showcased both the show’s potential for heated discourse and a more fr…