[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2008/images/08/14/art.pelosi.ap.jpg caption="Pelosi said some Clinton backers have been 'less than gracious.'"](CNN) - House Speaker Nancy Pelosi suggested Wednesday some supporters of Hillary Clinton's White House bid need an attitude adjustment.
Appearing on a San Francisco radio show to promote her new book, Pelosi praised Clinton's actions since dropping out of the presidential race two months ago but said some of her backers have not acted so nobly.
"I think Hillary Clinton has been very gracious," Pelosi said on KGO radio. "I think some of her supporters have been less than gracious."
Polls have shown the majority of Democrats who voted for Clinton during the party's primaries will support Obama in November, but a highly-vocal minority has made it clear they won't support the Illinois senator under any circumstances.
One group of disenchanted Democrats have formed a coalition popularly referred to as "Party Unity My A–," while the AP reports Thursday other backers of Hillary Clinton plan to paper Denver, the city hosting the Democratic convention, with outraged fliers to express their disapproval with Obama as the presidential nominee.
Clinton herself has urged party unity, though she appeared to fuel some of the fire last week when she left open the possibility of placing her name in nomination at the party's convention. Critics have said that move would only serve to highlight rifts in the party on primetime television.
Speaking Wednesday, Pelosi also brushed aside comments made by Bill Clinton during a recent interview, during which the former president refused to say if he though Obama was ready to be Commander-in-Chief.
"I can't answer for Bill Clinton," she said. "It's hard when you're in a primary election. Losing is very, very difficult."
In the wide-ranging interview, Pelosi also had tough words for onetime Democrat Joe Lieberman, now an ardent supporter of John McCain's White House bid. The House Speaker called Lieberman's recent comments suggesting Obama has not always put American first "totally irresponsible."
Pelosi also said Lieberman, who still caucuses with the Democrats, may not be welcomed back by the party next January.
"The Democrats in the Senate are in a tough spot. They have 51 votes. Joe Lieberman organizes with them," she said. "In 85 days or something, they will have five more Democrats. They won't need him to make the majority. And it will be interesting to see what the leadership in the Senate, the Democratic leadership in the Senate, does at that point in terms of Joe Lieberman's chairmanship of his committee."