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It's Ed Markey鈥檚 race to lose. 聽

The veteran Democratic congressman has a seven-point lead over Republican Gabriel Gomez in the special election for US Senate in Massachusetts, according to a new poll by the League of Conservation Voters and Public Policy Polling.

The poll is the third in recent days to show Mr. Markey, a four-decade veteran of the House of Representatives, with a healthy margin over Mr. Gomez, a Navy SEAL and businessman who is making his first major foray into politics.聽

A poll last week by Boston public radio station WBUR put Markey鈥檚 lead at six percentage points, while a Suffolk University/WHDH-TV poll gave him a towering 17-point advantage.

With less than six weeks until Election Day, Markey remains the comfortable favorite, although to understand why you have to read between the polling numbers, says Marc Landy, a political scientist at Boston College.

鈥淧olls vary, and they should be taken with a salt-shaker of salt,鈥� he says, 鈥渂ut what Markey鈥檚 got that鈥檚 more substantive is a lot of money, a lot of name recognition, and a very Democratic state.鈥�

To overcome that, Gomez will need both elbow grease and a Markey misstep. He can run a brilliant campaign, Mr. Landy says, but unless Markey makes a major fumble, the Democrat鈥檚 advantages may be too significant to overcome.

But the Massachusetts Democratic establishment isn鈥檛 resting just yet. That skittish attitude comes courtesy of one man: Scott Brown.

In 2010, Mr. Brown, a Republican state senator and self-proclaimed 鈥淲ashington outsider,鈥� stormed to a surprising victory over Massachusetts Attorney General Martha Coakley in another special Senate election. His victory had a meaningful effect in Washington, tipping the number of Republicans in the Senate to 41 鈥� just enough to maintain a filibuster.

Though Brown lost his seat just two years later to Democrat Elizabeth Warren, his meteoric and unexpected rise in the traditionally Democratic Bay State remains a cautionary tale for the party faithful.

But Gomez is not the next Scott Brown, says Professor Landy. For one thing, while Brown wasn鈥檛 well known outside Massachusetts before 2010, he鈥檇 been 鈥渨orking like a dog for a decade鈥� in state politics. Gomez's name recognition, by comparison, 鈥渋s dreadfully low,鈥� he says.

Of 880 likely voters polled in the recent PPP survey, 48 percent said they planned to vote for Markey and 41 percent favored Gomez. More than 10 percent of voters said they were still undecided. 聽聽

The gap between the two candidates has widened since the May 1 primary, when another PPP poll showed Gomez inching within four percentage points of Markey. Since then, Markey has consolidated his lead within his own party, suggesting that 鈥渢he more Democrats learn about [Gomez] the less crossover appeal he has,鈥� the pollsters wrote.

But even as Markey widens his margin over Gomez, experts are keeping close tabs on the leanings of the state鈥檚 independent voters. While registered Democrats outnumber Republicans 3 to 1 in Massachusetts, independents account for about half the voter rolls.

They鈥檙e the ones Gomez will have to rope in if he wants to pivot the race in his favor. And he鈥檚 chipping away at that base. His share of independent likely voters has jumped from 47 percent to 56 percent in the past three weeks, according to the two PPP polls.

Many voters, however, still say they don鈥檛 know enough about the fresh-faced investment banker to make a call one way or the other. A full one-quarter of likely voters aren鈥檛 sure if they have a favorable or unfavorable view of him. (Only 11 percent, on the other hand, aren鈥檛 sure about the far more recognizable Markey.)

What鈥檚 more, only 19 percent of minority voters have a positive impression of Gomez, although he hopes to pick up votes with that group in part by accentuating his own Latino heritage (he鈥檚 the child of Colombian immigrants).聽

But that will be an uphill battle, even for a man with bona fide emigrante credentials. Latinos make up just 6 percent of the Massachusetts electorate, and in 2012 they supported Democrats 9 to 1.聽

Gomez's last best hope, Landy says, will be Massachusetts moderates.聽

鈥淚n some ways," he says, "Gomez is a great candidate for the Republicans here because he鈥檚 hardly a Republican at all.鈥澛�