Filmmaker Michael Moore has launched an ambitious project to document U.S. election day, and he is urging his one million online fans to help him out.

The famed political activist wants to record the events of 6 November (12) at grassroots level by collating images of voters casting their ballot at the polling booths.

He has taken to to ask his 1.2 million followers to send him photographs of them placing their vote, and he will add them to a slide show on the home page of his website.

As he encouraged his fans to head to the polls, Moore tweeted, "Here we go! Take an Obama election day photo and tweet it to me with 2012 photos & I'll post on my site."

U.S. President Barack Obama goes up against his Republican rival Mitt Romney in the polls on Tuesday (06Nov12).