Closest thing I can think of to a Progressive televangelist is Al Franken! In his last book (the tiltle escapes me just now), there was a powerful piece of satire on the "SupplySide Jesus" that would have had Jesus and the OT prophets cheering him on, pounding the table and each other, with tears in their eyes from laughter!
Jim Wallis would be a good one for a regular program along the lines of a progressive 700 Club. It could have a panel of co-hosts: Rev. Barry Lynn of the Americans United for Separation of Church and State, Rabbi Michael Lerner of Tikkun magazine and the book, The Left Hand of God, with Marcus Borg, John Dominic Crossan, and Bishop Spong as frequent guests.
A great choice for televangelist to worship with and to hear preach would have been William Sloane Coffin. Too bad.