Feisty election slogan: I'll show you the back of my hand

Scarlett Johansson, Jon Hamm with his partner Jennifer Westfeldt, Natalie Portman, Zach Braff, ordinary Americans and Texan Rick Perry show their support for Obama

Forget the traditional T-shirts, bumper stickers and pin badges. This election's hottest accessory is a feisty slogan scrawled in black marker pen on the back of your hand.

In a move that recalls its hopey changey ethos of 2008, President Obama's campaign has asked supporters to cover a few inches of spare flesh with a short message explaining "what our country most needs". Volunteers are then invited to upload an image of themselves to social networking sites, under the hashtag #forall. It's not all been plain sailing, though. The Republican governor of Texas, Rick Perry, tweeted a shot of his hands covered with the words $16 trillion. Or: "how much Obama added to the national debt #forall our children."