1.   But Jeremy Rifkin, a longtime opponent of biotechnology, said he believes the campaign will backfire.

2.   But last fall, its anti-spam campaign backfired when the service blocked legitimate e-mail from QueerNet, a nonprofit gay and lesbian Web site based in San Francisco.

3.   But that campaign backfired.

4.   It is feared that campaigns will backfire or fuel backlashes led by other studios.

5.   Some of the leading environmental groups, however, say they believe the new campaign will backfire because it will raise even more questions about biotech foods.

6.   Some political experts said the terror campaign had backfired because of the willingness of the victims to come forward with their stories.

7.   Whether the campaign against Clinton will backfire may be answered in the November congressional elections.

8.   But knowing a negative campaign can backfire, both Charlton and McGivan will always steer their fellow conversationalist back to England and its positives.

9.   But the campaign could backfire if Israel is drawn into war.

10.   Observers like Ilan, the museum curator, warn that the ultra-Orthodox campaign could backfire.