Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Democrats in Last-Minute Scramble for Support in Iowa Caucus VOA News There's a last-minute scramble for support ahead of Monday's Iowa's Democratic presidential caucus -- the first big test of voter preference in the November election. It's a crowded field with 11 contenders all hoping to be the Democrats' choice to stop U.S. President Donald Trump's re-election in November. Polls going into Monday's caucus show Senator Bernie Sanders and former Vice President Joe Biden neck-and-neck with Senator Elizabeth Warren and former South Bend, Indiana Mayor Pete Buttigieg close behind. But many caucus-goers have said they are still undecided and analysts say a few surprises are possible. Unlike primary elections, where actual ballots are cast, voters participate in caucuses by gathering in meetings at schoolhouses, town halls, empty stores, and even people's homes. They show their preferences by raising their hands or huddling in groups of supporters. WATCH: Related video by VOA's Kane Farabaugh .