Republicans in New Hampshire say former Sen. Scott Brown (R-Mass.) is running out of time to demonstrate he’s serious about a potential 2014 challenge to Sen. Jeanne ShaheenCynthia (Jeanne) Jeanne Shaheen2020 Dems back repeal of controversial New Hampshire voting law New Hampshire senator to ask 2020 Dems to back repeal of state residency law Embattled senators fill coffers ahead of 2020 MORE (D).

“New Hampshire Republicans are not quite desperate, but the hour is getting late,” Fergus Cullen, former chairman of the New Hampshire Republican State Committee,  told The Hill.

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Brown, who lost his Massachusetts seat to Sen. Elizabeth WarrenElizabeth Ann WarrenDemocrats' CNN town halls exposed an extreme agenda Minorities, older adults push Biden to top of 2020 poll The difference between good and bad tax reform MORE (D-Mass.) in 2012, has been stoking speculation about a potential Senate campaign in the Granite State for months.

He’s made repeated visits to New Hampshire and put his home in Wrentham, Mass., up for sale.

He also recently launched a new super-PAC in the state to help candidates in the 2014 

races and contributed $10,000 to the state GOP.

The efforts have enhanced Brown’s popularity with state party activists. And the National Republican Senatorial Committee (NRSC) is also urging Brown to jump in the race.

But despite the churning rumor mill, New Hampshire Republicans say there’s been little solid evidence that Brown is ready to commit to a campaign.

“I haven’t heard from anyone who’s received a phone call from him,” Cullen said.

“People are waiting to see if he’s actually serious about [running] or not,” said Ryan Williams, the state party’s spokesman.

Indeed, GOP activists have been confused by Brown’s overtures toward Republicans in New Hampshire, where he owns a vacation home.

He has made campaign stops for low-level, underdog candidates in unwinnable races and has left the impression he fits events into his schedule as he pleases rather than according to a grand plan.

“Everything he’s done has been fly-by-the-seat-of-his-pants. He’s accepted invitations without a rhyme or reason or without any clear strategy,” Cullen said.

According to a report in The Boston Globe, NRSC Chairman Jerry MoranGerald (Jerry) MoranLive coverage: Barr faces Senate panel as he prepares release of Mueller report Hillicon Valley — Presented by CTIA and America's wireless industry — House panel approves bill restoring net neutrality | FTC asks for more help to police tech | Senate panel advances bill targeting illegal robocalls Senate panel advances bill penalizing illegal robocalls MORE (R-Kan.) and Vice Chairman Rob PortmanRobert (Rob) Jones PortmanSherrod Brown asks Trump Fed pick why he referred to Cleveland, Cincinnati as 'armpits of America' Senate Republicans tested on Trump support after Mueller GOP senator wears shirt honoring Otto Warmbier at Korean DMZ MORE (R-Ohio) have both pressed Brown to get in the race.

“I don’t think Scott Brown is just fooling around,” Moran said.

Shaheen poses a significant challenge for the GOP, despite the party’s view that she is vulnerable.

A former governor who defeated Republican Sen. John Sununu in 2008, Shaheen already has nearly $3 million cash on hand for her reelection campaign.  A Public Policy Polling survey in September found her with a 51 percent approval rating.

The two current Republican contenders, former state Sen. Jim Rubens and conservative activist Karen Testerman, aren’t considered top-tier candidates.

And two top Republican prospects for the race — state Senate Majority Leader Jeb Bradley and former Rep. Charlie Bass — have decided against running.

Brown could be the GOP’s last best hope. He’d enter the Republican primary with strong name recognition and easy access to cash.  The PPP survey found Brown trailing Shaheen by 4 percentage points in a hypothetical race.

One national Democrat said the party “would take Scott Brown seriously.”

One New Hampshire Republican operative said Brown has built strong relationships with party activists with his repeated visits.

“Being receptive and responsive is kind of the New Hampshire way, and I think people like him doing that up here,” the operative said.

But with less than a year until Election Day, impatience is growing.

The conservative New Hampshire Union-Leader last month urged Brown to “stop flirting with” the state.

“Despite the curious way he’s going about this, most people — including me — continue to be pretty interested in Scott Brown,” Cullen said.

“It is time, though, if he were serious about it, to kind of get serious about it and start running.”