It's hard to imagine a more perfect setting for the return of Rage Against the Machine than Denver during the Democratic National Convention. Likewise, there couldn't have been a better supporting cast of kindred artists than State Radio, the Coup and the Flobots, who owe a debt to Rage ideologically and, to some extent, musically. With incendiary anti-war politics informing the proceedings, stoked by the presence of members of the Iraq Veterans Against the War, and a planned post-show march to the Pepsi Center, the tension was palpable. By the time Rage took the stage, the Coliseum felt like a powderkeg ready to explode, and as the band ripped through fevered versions of its most urgent material, Zack de la Rocha barked at the crowd like a rabid pit bull. If ever there was a once-in-a-lifetime show, this was it.