Massachusetts Rep. Joe Kennedy Joseph (Joe) Patrick KennedyMassachusetts town clerk resigns after delays to primary vote count Bogeymen of the far left deserve a place in any Biden administration Hillicon Valley: Election officials prepare for new Russian interference battle | 'Markeyverse' of online fans helps take down a Kennedy | GOP senators unveil bill to update tech liability protections MORE (D) holds a six-point lead over longtime incumbent Sen. Ed Markey Edward (Ed) John MarkeyMassachusetts town clerk resigns after delays to primary vote count Bogeymen of the far left deserve a place in any Biden administration Senate Democrats urge Amazon to recall, stop sales of explosive products MORE (D) in the Bay State's Democratic Senate primary, according to a Suffolk University/WBZ/Boston Globe survey released on Sunday.

Forty-two percent of voters said they supported Kennedy, while 36 percent backed Markey in the poll, which has a margin of error of plus or minus 4.4 percentage points.

Around 28 percent of voters said they were "undecided" on if they believed Markey should be reelected, while 19 percent said they were "undecided" on the senator's job performance.

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A University of Massachusetts-Lowell survey released earlier this month also showed a tighter race, with Kennedy polling at 35 percent support, while Markey came in with 34 percent support. That poll's margin of error was plus or minus 6.1 percentage points.

Kennedy, the grandson of former Attorney General Robert F. Kennedy, is running for the seat which was once held by his great-uncles former President John F. Kennedy and former Sen. Edward Kennedy (D-Mass.).

The 39-year-old progressive lawmaker is promising to bring generational change and a fresh perspective to the Senate as Washington remains divided on partisan lines. Kennedy has touted his positions on a number of issues, including immigration and health care, in the primary.

Meanwhile, Markey, 73, is relying on his experience in Washington, touting a long list of achievements including co-authoring the Green New Deal.

The poll was conducted on February 26-28 among 500 likely voters in the Democratic primary. The margin of error is plus or minus 4.4 percentage points.