AH, if those White House walls could only talk. Not that their inability to reveal all deters writers of fiction from charging in to fill the vacuum. One of the better efforts to substitute imagination for fact is Nixon's Nixon by Russell Lees, now at the Tivoli (Keith Jochim as Nixon and Tim Donoghue as Kissinger pictured right). In the autumn of 1974, on the evening before his go- or-be-pushed resignation, president Richard Nixon had a three-hour private session with Henry Kissinger. It focuses on the characters of the men, exaggerated cartoon-style. The Edinburgh Festival liked this one a lot, and Dublin should find it at least a hearty hoot.