There could be no doubt about the theme of President Bush's Iraq war strategy speech on Wednesday at the Naval Academy. He used the word victory 15 times in the address; "Plan for Victory" signs crowded the podium he spoke on; and the word heavily peppered the accompanying 35-page National Security Council document titled, "Our National Strategy for Victory in Iraq."

Although White House officials said many federal departments had contributed to the document, its relentless focus on the theme of victory strongly reflected a new voice in the administration: Peter D. Feaver, a Duke University political scientist who joined the N.S.C. staff as a special adviser in June and has closely studied public opinion on the war.

Despite the president's oft-stated aversion to polls, Dr. Feaver was recruited after he and Duke colleagues presented the administration with an analysis of polls about the Iraq war in 2003 and 2004. They concluded that Americans would support a war with mounting casualties on one condition: that they believed it would ultimately succeed.

That finding, which is questioned by other political scientists, was clearly behind the victory theme in the speech and the plan, in which the word appears six times in the table of contents alone, including sections titled "Victory in Iraq is a Vital U.S. Interest" and "Our Strategy for Victory is Clear."