Samuel L Jackson has told Americans to ''wake the f**k up'' and vote for President Barack Obama.

The 'Pulp Fiction' actor has channeled his inner bad-ass into an explicit video titled 'Wake The F*** Up For Obama', encouraging citizens to vote for Obama over Mitt Romney in November's elections.

The video - which is done in a fairytale-style - shows a pair of exhausted parents ignoring their daughter when she suggests they re-elect the current president.

Samuel appears out of nowhere to root them on in rhyming couplets, saying: ''Sorry my friend, but there's no time to snore. An out-of-touch millionaire's just declared war.

''On schools, the environment, unions, fair pay. We're all on our own if Romney has his way. And he's against safety nets; if you fall, tough luck. So I strongly suggest that you wake the f**k up.''

Samuel - who voiced a spoof audio book titled 'Go the F*** to Sleep' last year - gives another foul-mouthed message to her siblings, telling them: ''Listen to your little sister, wake the f**k up!''

He also draws reference to the 2008 bake sales for Obama, shouting down a bullhorn: ''Get out there and sell some cakes and cookies!'', advising the entire family to say: ''Hell, no m*********s!''

Obama is battling it out to defeat Republican Romney in the Novemeber 6 presidential vote.