From the synopsis on HBO's website:
Ironically, as the media exploits this latest fiasco, the on-air hosts find their groove. Rhodes is thrilled to get her own cover story in the Washington Post Magazine and a billboard in Times Square. Maron has worked through his anxieties, as have Garofalo and Seder. The New York ratings are unexpectedly high - Franken beats Rush Limbaugh, and Rhodes outpaces right-wing rival Sean Hannity. Encouraged, management is able to attract additional investors long enough to keep the venture afloat through November.
In December 2004, a new round of investors brings Air America a measure of financial stability. With 40 affiliates and counting, the voices of the left are now being heard, loud and clear, from coast to coast.
http://www.hbo.com/docs/programs/leftofthedial/synopsis.html