Barack Obama Cartoon (Birdsong)

ABC News has learned that the campaign of Sen. Hillary Clinton, D-N.Y., has registered the names of two Web sites with the express goal of attacking her chief rival, Sen. Barack Obama, D-Ill.

It's the first time this election cycle a presidential campaign has launched a Web site with the express purpose of of launching serious criticisms on a rival.

Votingpresent.com and Votingpresent.org are domains hosted by the same IP address as official Clinton Web sites, such TheHillaryIKnow.com, which was launched with much fanfare this week.

The Clinton campaign intends to use these new Web sites to paint Obama as cowardly.