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WASHINGTON, Aug. 21 — A new group of prominent conservatives plans to begin a multimillion-dollar advertising campaign Wednesday to urge members of Congress who may be wavering in their support for the war in Iraq not to "cut and run."

The group, Freedom's Watch, is rolling out television, radio and Internet advertisements in more than 20 states and 60 Congressional districts.

Ari Fleischer, President Bush's former press secretary and a spokesman for the group, said it would initially spend $15 million on the effort, which will also encourage voters to put pressure on their representatives for continued support of the war.

Mr. Fleischer declined to say in an interview Tuesday which members of Congress were on its list, but he indicated that it would include some Republicans as well as Democrats.

Mr. Fleischer said the central message of Freedom’s Watch is that “the war in Iraq can be won and Congress must not surrender.”

The advertisements feature Iraq war veterans and parents of veterans who lost family members in the war urging lawmakers who have supported the war not to switch their vote.