NEW YORK -- For the past five years, liberal books, especially the Bush-bashing kind, have been a thriving market. A new online club is betting that they can evolve from a market to a movement, long after the president has left office.

The Progressive Book Club, which officially launched Monday, combines the offerings of a traditional book club with the interactive features of an online social network and the ideals of a grass-roots political party.

The new club offers a selection of works each month, at discounts from 10 percent to 40 percent, and perhaps up to 80 percent.

The Web site, www.ProgressiveBookClub.com, will also feature videos, audios, forums for debates, book reviews and recommendations.