Maine Super Tuesday Democratic Primary: Biden, Sanders Battle

AUGUSTA, ME — Former Vice President Joe Biden and Vermont Sen. Bernie Sanders are battling for the top spot in Maine's Super Tuesday Democratic presidential primary. The race is too close to call, with Biden holding a slight 34 percent lead over Sanders' 33 percent as of 9:45 a.m. Wednesday, local time.

Massachusetts Sen. Elizabeth Warren was trailing both candidates with 16 percent of the unofficial vote tally.

Biden polled well in early Super Tuesday vote tallies in the Maine Democratic presidential primary, where polls have closed and counting is underway.

Biden appears to be carrying the momentum of Saturday's landslide South Carolina primary win into Super Tuesday voting in primaries across the country.

At stake are Maine's 24 pledged delegates.

Get The Latest: Super Tuesday Nationwide Results

For the first time in 20 years, Maine voters cast their preferences in a state-run primary rather than in party-led caucuses. The state's primary voting system is significant in that Maine is the first in the United States to enact rank-choice voting, in which voters order candidates from first to last choice.