“The defense has two ways to negate Russert’s powerful testimony: 1) They can say his memory’s bad. They’ve tried, with mixed results. 2) They can say he’s lying. But then they need to show a motive to lie. If fear of embarrassment is the best they’ve come up with, I think they’re in trouble.” The prosecution rests in the Scooter Libby trial, after a two-day appearance by — and defense grilling of — NBC’s Tim Russert.