NEW YORK — Bill Maher couldn’t have asked for a better act to follow. Maher took the stage at the Radio City Music Hall Monday after Ann Coulter – with whom he’d spend the rest of the night debating – had held forth for 15 minutes on the sins of liberals. The applause for Maher was huge – exactly as one might expect in not-exactly-blood-red midtown Manhattan. “If we were having this debate in Springfield, Mo., it would be different,” Maher said. But even in mostly hostile territory, Coulter was no shrinking violet.