The Obama campaign, in its push to remind voters why they cast their ballots in 2008, is releasing a documentary that plays up the president's accomplishments. The two-minute trailer is for the documentary, "The Road We've Traveled," which takes a look back on President Obama's first term, from the collapse on Wall Street to the fight over health care. "Road," which is narrated by Tom Hanks and directed by Davis Guggenheim, who helmed the Oscar winning environmentalist documentary, An Inconvenient Truth. "Road" will be shown at Obama campaign events next week.