Allegations about Sen. John McCain's relationship with lobbyist Vicki Iseman have resurrected questions over his role in WQED Pittsburgh's controversial, but ultimately unsuccessful, efforts to sell its sister television station WQEX-16 in the 1990s. The proposed three-way deal involved a license swap between Ms. Iseman's client, Paxson Communications Corp., and Christian broadcaster Cornerstone TeleVision of Wall, which operated WPCB Channel 40. The transaction called for Channel 40 to assume the noncommercial license of Channel 16 and sell its own commercial license to Paxson for $35 million, split between Cornerstone and cash-strapped WQED. Paxson would gain entry into the Pittsburgh market...