But Mr. Keene and many other conservative fund-raisers and organizers acknowledge that the grass-roots hatred for Mrs. Clinton and her husband has subsided substantially since they left the White House.

National efforts to raise money to stop Mrs. Clinton’s Senate campaigns in New York in 2000 and 2006 never got off the ground. Nor did plans to raise money for a “counter-Clinton” library in Little Rock. And conservatives note to their consternation that at the moment the woman they treat as the incarnation of 1960s liberalism appears to be campaigning as the least liberal of the Democratic front-runners.

Still, Mr. Keene said, “Her image as the wicked witch of the left was burned in the minds of conservatives and the larger public before she tried to moderate her image.” He noted that polls consistently give her the highest unfavorable ratings among the front-runners, typically more than a third of the public. (Her favorable ratings are also unusually high.)

Howard Wolfson, a spokesman for Mrs. Clinton, said any nominee would face a barrage from the right. “I think that history demonstrates that whoever the nominee is is going to engender opposition from the right, and we will certainly be prepared,” Mr. Wolfson said.

Mrs. Clinton’s campaign has attracted some new enemies. John LeBoutillier, a former Republican congressman from New York and conservative commentator, said he started a Stop Hillary political action committee in part because he thought her opponents “gave her a free pass” in her two Senate races.

“I started by trying to figure out what it is about her that bugs the heck out of people,” Mr. LeBoutillier said, mainly by looking at public polls. He said his organization recently spent $20,000 to run television commercials in Iowa featuring footage of a handful of potential Democratic caucus-goers saying that they distrusted Mrs. Clinton as a power-hungry opportunist.

Still, he acknowledged that his group had struggled for money.

Richard H. Collins, a Dallas investor, has taken over an unrelated group that was conceived by the Republican consultant Arthur J. Finkelstein to oppose Mrs. Clinton. Mr. Collins, who redirected the group toward the presidential race, said he had put in about $200,000 in “seed money” to start a Web site, www.stophernow.com. It plays cartoons of Mrs. Clinton as the host of a late-night talk show who is in the habit of batting guests over the head with a hammer.