(Alex Wong/Getty Images)
Tuesday's primary results sharpened the emerging anti-incumbent, anti-establishment trend. That included one White House and Democratic establishment-backed incumbent going down (Pennsylvania's Arlen Specter) and another on political life support (Arkansas's Blanche Lincoln). And the atmosphere remains very tough for the incumbent party. But on balance Democrats had a good night on Tuesday and should be pleased with how the results shake out for November. Here are five reasons why (and, from bloleague Mary Kate Cary, five reasons the GOP should be happy).