From the McClatchy: Pentagon worried about Obama's commitment to Afghanistan
"I think they (the Obama administration) thought this would be more popular and easier," a senior Pentagon official said. "We are not getting a Bush-like commitment to this war."

Monday's assessment initially was to include troop recommendations, but political concerns prompted White House and Pentagon officials to agree that those recommendations would come later, advisers to McChrystal said. Although the White House took a hands-off approach toward Afghanistan earlier this summer, Pentagon officials said they're now getting more questions about how many troops might be needed and for how long.

Some White House officials said the administration feels it was pressured to send the additional 17,500 combat troops and 4,000 trainers earlier this year, before the administration was comfortable with its plan for Afghanistan , because of the country's election in August.
After all the talk on the campaign trail of Iraq being the wrong war and Afghanistan being the right one, it looks like there are some early signs that the administration is already beginning to waver....