With two primaries and two caucuses already under the nation's belt, voters in Massachusetts and 13 other states are heading to the polls Tuesday to have their say in who should be the Democratic presidential nominee in this November's general election.

Three Democratic candidates dropped out of the race in the days leading up to Super Tuesday. Those still vying for the nomination are: former Vice President Joe Biden, former New York City Mayor Mike Bloomberg, Hawaii Rep. Tulsi Gabbard, Vermont Sen. Bernie Sanders and Massachusetts Sen. Elizabeth Warren.

Biden scooped up the endorsements of former presidential race rivals former South Bend, Ind., Mayor Pete Buttigieg and Minnesota Sen. Amy Klobuchar on Monday evening — bolstering his goal of cementing himself as the leader of the party’s moderate wing — just days after winning South Carolina's Democratic primary with 48.4% of the vote.

Sanders has the most delegates so far with 60, after winning the New Hampshire primary and Nevada caucus earlier this month, while Biden is close behind with 54 delegates. Warren trails with eight delegates and is hoping for a win in her home state of Massachusetts — though polls leading up to Super Tuesday showed a neck-in-neck race between her and Sanders.

There's another Massachusetts candidate on the ballot this Super Tuesday — former Gov. Bill Weld, who's running against incumbent President Donald Trump for the Republican nomination.

Below are live, county-by-county results of the Massachusetts Democratic and Republican primary elections from the Associated Press.