They won’t get caught napping again. At least, they say they won’t.

Democrats understandably uncertain about former Massachusetts Senator Scott Brown’s political intentions have ratcheted up their defensive mechanisms as Brown has fed speculation he could run for Senate again – this time in New Hampshire

On Thursday night, the Democratic National Committee circulated video of Brown in New Hampshire appearing to talk about Massachusetts voters when he wanted to be talking about Granite State voters.

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That footage was captured by American Bridge, a group dedicated to monitoring the public statements of Republican candidates. The attendance of a D.C.-based super PAC at a speaking engagement by a former elected official who has not made clear the scope or venue of his political aspirations signaled a renewed opposition-party interest in an old foil.

Also Thursday, Senator Elizabeth Warren served notice to her former rival that, if he challenged Democratic New Hampshire Senator Jeanne Shaheen, “you’ll have your hands full.”

One Democratic strategist on Friday said that the party was determined not to be surprised again by Brown, who stunned the political world in 2010 by winning the Senate seat long held by the late Edward M. Kennedy over Democratic Attorney General Martha Coakley.

Since losing to Warren last year, Brown has worked to earn Democratic attention. He has sold his home in Wrentham, and excised the Bay State designation from his Twitter handle. He has paid numerous visits to New Hampshire, including Thursday’s and a scheduled state party holiday party on Dec. 19. He contributed $10,000 to the state’s Republican Party.

Still, people close to Brown put the odds of his challenging Shaheen at no better than 50/50. And Brown has yet to articulate fully a reason why he would run in New Hampshire next year, rather than against Massachusetts Senator Edward J. Markey, a newly elected senator many Republicans consider vulnerable in the cross-hairs of a capable challenger.