The insurgence of President Donald Trump, along with congressional Republicans' willingness to support him, have Klarman changing his tune.
The survey released on Monday finds Democrats with a 19-point advantage statewide on the generic ballot, with 54 percent of respondents saying they plan to or are leaning toward voting for Democrats, compared to only 34 percent for Republicans.
Factors at play include a slide in self-reported registration among Democrats, which is a sign of waning engagement; consolidation among Republicans of their base; and better results for the GOP among less-educated Americans generally, and non-college-educated white women in particular.
Only 35 percent of state residents approve of the new tax reform law, while 46 percent disapprove. Because most of the seats are either open or already held by a Republican, the funds raised by Democrats are spread among more candidates vying for their party's nomination.
WaPo's poll also suggests neither Democrats nor Republicans hold an advantage in support among the 42 percent of likely voters who want congressional candidates to share their views on the issue.
Participants take part in the March for Our Lives Rally in NY on March 24, 2018. He donated $5,400 to Hillary Clinton's campaign once Trump became the GOP's candidate for the general election.
Only 35 percent of New Jersey residents approve of the law and 46 percent disapprove, according to Monmouth University.
Republicans have sought to balance that risk by tying Democratic candidates to Pelosi.
This Republican billionaire using his tax breaks to fund Democrats
Almost 58 percent of voters oppose the tax increase, including 39 percent who say they strongly reject the legislation, according to a survey the University of California, Berkeley's Institute of Governmental Studies conducted shortly after the measure passed.
His money has been spread out to Democrats running for 56 House seats and 22 Senate contests, including checks to Chuck Schumer, the highest-ranking Democrat in the Senate, and Adam Schiff, the top Democrat on the House Intelligence Committee.
Only one New Jersey lawmaker, Rep. Tom MacArthur, R-3rd Dist., supported the Republican tax bill.
Fueling the negative numbers for Republicans was New Jerseyans' disapproval of Trump's performance in office.
This ABC News/Washington Post poll was conducted by landline and cellular telephone April 8-11, 2018, in English and Spanish, among a random national sample of 1,002 adults and 865 registered voters.
The fundraising amounted to $351,740 per Democrat and $525,506 per Republican. Results have a margin of sampling error 3.5 points, including the design effect.
The survey was produced for ABC News by Langer Research Associates of NY, N.Y., with sampling, data collection and tabulation by Abt Associates of Rockville, Md.More news: Unseasonal warmth in London for the Commonwealth Heads Meeting