Three presidential candidates and two very different views of Iraq will be on full display on Tuesday as Gen. David H. Petraeus, the top American commander in Baghdad, testifies before the Senate in a marathon session of war and White House ambitions.
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Mr. McCain, a Republican, has the logistical advantage in appearing before his two Democratic competitors. General Petraeus is set to testify first to the Armed Services Committee, beginning at 9:30 a.m., and Mr. McCain, the ranking Republican member, will be the second to speak, after the committee chairman, Senator Carl Levin, Democrat of Michigan.
Mrs. Clinton, a more junior member of the panel, will speak later. Mr. Obama, a junior member of the Foreign Relations Committee, which is holding its hearing in the afternoon, will be the 13th on that panel to speak, perhaps after the evening news.
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