That brigade stuff predated his trip to see the troops and his discussions with Petraeus.
Here ya go, since you so desperately need a link:
http://www.guardian.co.uk/world/2008/jul/03/barackobama.uselections20081
Democratic presidential nominee Barack Obama today said he would "refine" his position on withdrawal from Iraq after meeting with military commanders there this summer, then later insisted he had not softened his commitment to remove US combat forces within 16 months of taking office.
Speaking with reporters at an airport in Fargo, North Dakota, the Illinois senator appeared open to altering his campaign pledge to have US combat troops home from Iraq within 16 months of taking office.
"I am going to do a thorough assessment when I'm there,'' he said. "I'm sure I'll have more information and continue to refine my policy."
The Republican party leapt at the comments and accused Obama of reversing himself, and at a press conference later, Obama sought to clarify his remarks.
"Let me be as clear as I can be: I intend to end this war," he said. "I have seen no information that contradicts the notion that we can bring our troops out safely at a pace of one to two brigades per month," with all out within 16 months. "This is the same position that I had four months ago."
Obama founded his campaign on a strident anti-war message, which dates back to a speech he gave in Chicago in 2002, while still a state senator.
Republican nominee John McCain was an early supporter of the troop surge in Iraq and has backed the war from the beginning.
He said he will keep US forces there to maintain the security gains the surge has facilitated. He has said he plans to have most US combat troops home by the end of his first term.
Now, keep in mind this was BEFORE--I say again, BEFORE--that major policy speech in July that everyone pretends not to have heard, you know, the one that was rerun on every channel a half dozen times, YOUTUBED to death, and printed in every newspaper from sea to shining sea...and then, a month or so ago, he refined even further:
President Obama leaned heavily toward field commanders' preferences in setting a time frame for an Iraq pullout as he weighed the fervent desires of anti-war supporters who propelled him into office and the equally strong worries of war generals.
"To this very day, there are some Americans who want to stay in Iraq longer, and some who want to leave faster," Obama said in his announcement Friday, summing up a debate that has divided the country like no other since the former President George W. Bush launched the U.S. invasion six years ago.
Obama's description suggests he arrived at a split-down-the-middle compromise with one of the first and most important tasks of his young presidency.
But accounts of the process from officials in the White House, at the Pentagon and across the administration, who all requested anonymity so they could speak more candidly about behind-the-scenes discussions, show otherwise.
At stake was the promise that most defined and drove Obama's presidential bid: to bring all combat troops home -- effectively, to end the war -- 16 months after taking office. The details he offered in an appearance Friday before Marines at Camp Lejeune, North Carolina, depart from that pledge in several ways:
--The combat withdrawal will take three months longer than he promised. It is now to be completed by the end of August 2010, 19 months after Obama's inauguration.
Though what Obama emphasized most as a candidate was his determination to bring about a quick end to the war, in the fine print of almost all his statements was a commitment to flexibility.--
The withdrawal will not happen at an even pace of one combat brigade per month, as he had repeatedly said. Instead, it will be backloaded. The force posture for this year and into the first few months of 2010 probably will be essentially the same as it would have been under Bush. Under Obama's plan, troops will start leaving in large numbers probably only next spring or summer. The president intends to leave decisions about the pace to field commanders......
http://www.foxnews.com/politics/first100days/2009/02/28/obama-considered-different-options-iraq-withdrawal-strategy/100days/Is that sufficient linkage for you?
You gotta keep up. The first adjustment took place well before the Democratic National Convention. Well before the election. Well before the inauguration. See, what he promised on the campaign trail was that he would MODIFY his position, but way too many people refused to believe the man. "Awww, he's just saying that to get ELECTED!!!" Er, no--he isn't. He meant it. And he fleshed out what he said back in July last month.