Based on this story in the Financial Times ,I believe that Barack Obama will change his mind about withdrawing our troops from Iraq. His decision will be based on one principle. Political expediency. He will "Modify" his plan and mold it in to the most efficient model of assuring the most votes in November.

Apparently he has already started this process:

...Senior advisers to Mr Obama say the campaign is constantly monitoring and debating its response to the situation on the ground in Iraq. But they say that Mr Obama has no plans to modify his timetable for US troop withdrawal. However, Mr Obama and some of his most senior foreign policy advisers have been dropping tantalising hints that there might be a new flexibility over their definition of “withdrawal”...

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Apparently it depends on the definition of withdrawal!

..."Mr Obama frequently points out that he will consult US commanders on the ground and the Iraqi government about his withdrawal plans. “We have a great deal of flexibility about the modalities of the withdrawal but we are clear that it will take place under an Obama administration,” said a senior Obama adviser.

In practice, say analysts, that leaves a lot of leeway for interpretation..."

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Modalities of the withdrawal?

Nothing like giving yourself the Grand Canyon of possible alternatives to making a decision.
The fact is Obama has no idea of how he will handle Iraq or even Iran for that matter. Even his advisors seem to disagree.

This is why McCain is gaining and will WIN in November. Straight Talk!