Bush's isolation recalls Lyndon Johnson predicament when opposition to the Vietnam War convinced him that he should not run for re-election.
Likewise, Zelizer said the now-open revolt of increasing numbers in Bush's own party could be "very dangerous" for the president.
It makes it much more difficult for Bush to get support during the final two years of his presidency, increases the likelihood his policies will be seen by history as a mistake and puts his party in a very difficult position leading up to next year, Zelizer said.
Bush believes that the "long march of history" will prove him right and is content to stand alone, if he must, until that day.
He is so sure of eventual success in Iraq that he once told some leading Republicans: "I will not withdraw even if Laura and Barney are the only ones supporting me," referring to the first lady and his Scottish terrier, Bob Woodward's recent book, State of Denial, says.
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