Advertisement Super Tuesday: Mass. voters line up early to cast primary ballots Mass. voter polls put Clinton, Sanders in dead heat; Trump tops GOP Share Shares Copy Link Copy

Massachusetts voters are flocking to the primary polls in record numbers Tuesday as presidential hopefuls joust for delegates to keep their footing in a hotly contested race for both parties.Video: Record turnout possible in primary | Bill Clinton stumps for Hillary People had already started lining up at one polling place in the Boston suburb of Arlington even before polls opened at 7 a.m.Secretary of State Bill Galvin predicted that more than 700,000 republican ballots may be cast and the total number of votes could be closer to 1.8 million. Watch the reportAs of 9 a.m., 26,442 voters had cast ballots in Boston -- an increase from that seen with 2008's record breaking turnout, according to the Secretary of State Communication Director Brian McNiff.Republican voters will choose between the five remaining candidates -- Donald Trump, Marco Rubio, Ted Cruz, John Kasich and Ben Carson.LiveWire Mass. Primary | Primary results: Statewide | Town-by-town Although Trump has held a solid lead in most polls, Kasich is hoping for a strong second place finish.Democrats Hillary Clinton and Bernie Sanders are locked in a close race in Tuesday's primary as they try to secure their party's nomination.Election MapWhile Clinton has much of the Democratic establishment behind her, Sanders is banking on strong support from the state's college-age voters to help keep his candidacy afloat.Republican Massachusetts Gov. Charlie Baker has cast his ballot in the state's presidential primary, but he did not say who earned his vote. He did, however, say who he did not vote for.After voting Tuesday morning in his hometown of Swampscott, Baker said he did not vote for Trump or Cruz.Get all the results on the WCVB appBaker had originally endorsed New Jersey Gov. Chris Christie but did not select a new favorite after Christie dropped out of the race, even after Christie backed Trump.The Massachusetts governor has been highly critical of Trump.Baker said Monday he was likely to vote for either Kasich or Rubio.Massachusetts Secretary of State William Galvin says a record turnout is possible.The state's most hotly contested primary was in 2008, when 1.8 million voters cast their ballots.The Democratic Galvin says one hint that turnout will be high is the fact that 20,000 Massachusetts voters have left the Democratic party since Jan. 1. Most of those are now considered unenrolled, but about 3,500 switched to the Republican party.Galvin attributes the switch to the "Trump phenomenon."10978732