President Barack Obama waves from the door of Air Force One at the Cape Cod Coast Guard Station in Bourne, Mass., after ending his vacation on Martha's Vineyard early, Friday, Aug. 26, 2011. (AP Photo/Stew Milne)

WASHINGTON (AP) — President Barack Obama's challenge over the next year will be to boost his standing with four voting groups that helped him win the White House.

Whites, women, younger voters and liberals have turned away from him to certain degrees since his 2008 election.

An analysis of Associated Press-GfK polling shows that he's got work to do with all of those important voting groups.

They're likely to be the top targets of his 2012 campaign as he seeks to cobble together a coalition that's diverse enough to help him win re-election in tough economic times.