Call them the Obamacans: They are against continuing the Iraq war and reject what they see as Mr. Bush's unconstitutional buildup of executive power. While the conservative Republican base rejected Senator McCain in the early primaries for his push for bipartisan campaign finance regulation and amnesty for illegal immigrants, the Arizona senator's hawkish support for the Iraq war has alienated what was once his national constituency, anti-Bush Republicans.

The Obamacans include a former senator of Rhode Island, Lincoln Chafee; a former senior Justice Department official under President Reagan and senior legal adviser to Mitt Romney's presidential campaign, Douglas Kmiec, and a granddaughter of President Eisenhower, Susan Eisenhower. The group one day may include Senator Hagel, a Republican of Nebraska, who has co-sponsored Iraq withdrawal legislation with leading Democrats. Asked yesterday on CNN whether he would endorse his party's presumptive nominee, Mr. Hagel said he would base his support on the candidates' positions on withdrawing from Iraq