An animated dissection of political events and offbeat news, punctuated by the host’s sardonic humor, “The Rachel Maddow Show” has debuted with a strength that surprised even MSNBC executives. An average of 1.64 million viewers tuned in since the show launched on Sept. 8, more than double the number who watched the same hour in the first eight months of the year.

In her second week on the air, Maddow beat CNN’s “Larry King Live,” a cable news institution — quite a feat for a self-described television novice and former AIDS activist who doesn’t even own a TV.