WASHINGTON — Jeb Bush’s money juggernaut is far eclipsing the efforts of his would-be rivals for the 2016 Republican presidential nomination, putting his two political committees on pace to amass an unprecedented sum of tens of millions of dollars by early spring.

The former Florida governor’s overwhelming dominance in the race to line up financial backers has come at a speed that has impressed longtime Republican money players, who say wealthy party backers have rapidly migrated to Bush since 2012 nominee Mitt Romney decided against another White House run two weeks ago.

At one Manhattan fundraiser for Bush at the Park Avenue home of private-equity titan Henry Kravis this week, about 25 attendees paid a minimum of $100,000 each just to get in the door. It’s one of six events for Bush’s PACs – including one next weekend in Palm Beach – with such a price.

“I think they will come up with an eye-popping figure,” said veteran Republican fundraiser Fred Malek.

Bush’s press for dollars has been so intense – averaging one fundraiser a day – that his Republican competitors do not even claim they can compete at his level and acknowledge that he is the unrivaled financial leader.

“Are they raising a lot of money? Yeah,” said Ray Washburne, a Dallas real estate developer who is heading efforts to solicit contributions for Gov. Chris Christie’s new political committee. “We’re in the making-friends stage.”

“Money does not buy elections,” Washburne added. “Look at Hillary and Obama back going into ’08 – she had all the money and he had none.”

Despite Bush’s robust lead, party strategists and fundraisers agree that there is still plenty of room for his rivals to maneuver because of the changed nature of this year’s money primary. Super PACs that can raise unlimited donations have already been embraced by the expected candidates, allowing them to scoop up massive contributions before their campaigns officially launch. And the pool of potential givers has greatly expanded in the last several years, as the freewheeling era of big-money groups has attracted a new class of donors.

“There’s a lot more room in this environment,” said Richard Hohlt, a Republican lobbyist in Washington who is helping raise money for Bush. “I am shocked, as a person who has done this since the Nixon campaign, how there are so many mega-donors who are willing to write significant checks. The point is, candidates can stay alive a lot longer.”

Still, there are mounting signs that Bush’s financial momentum is coming at other candidates’ expense – especially Christie’s. While the donor class seems increasingly intrigued by Gov. Scott Walker of Wisconsin, enthusiasm for Christie has dimmed, according to major Republican contributors and bundlers.

“Everybody says, ‘Bush, but I like Walker,’ or ‘Walker, but I like Bush,’ ” said one senior party figure, who declined to be named. “I don’t hear anyone saying Christie.”

Supporters of the New Jersey governor have been taken aback by the number of top Romney fundraisers who have already signed up with Bush.