Democratic caucus-goers express their preference through a show of hands, a sign-in sheet or by dividing themselves into groups according to candidate.

BBC: Caucus

She scribbled her name on a sign-in sheet, police said.

CNN: SHARE THIS

He helped people sign in and recalled handing the sheet on a clipboard to Loughner.

NPR: Records Provide New Look At Ariz. Shooting Spree