Cook Political Report, a top nonpartisan election handicapper, released new ratings changes on Friday for 12 House districts, with all but one shifting in favor of Democrats a year ahead of the 2018 midterms.

The newsletter highlighted that President Trump and the Republican majorities in Congress have generated a candidate boom for House Democrats, noting that many of them are political newcomers — a class that recalls the GOP’s candidates during the 2010 cycle.

Some of the most notable ratings changes include the shift of three House districts — GOP Reps. Dana Rohrabacher (Calif.), Martha McSally (Ariz.) and Rod Blum (Iowa) — from Lean Republican to toss-up.

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In California, Rohrabacher has been in Congress for nearly three decades, but The Cook Political Report pointed to his pro-Russia stance and his district’s shifting demographics as potentially tough obstacles for him next year. A crowded Democratic field is also shaping up to unseat him, and Clinton won the district by about 2 points.

Meanwhile, in Iowa, Blum has always been a top target for House Democrats, but President Trump was able to carry his district by 3 points. But the handicappers noted the district's left-leaning nature and also highlighted his potential Democratic opponent, state Rep. Abby Finkenauer, who is 28 and would be the youngest woman ever elected to Congress.

Other notable changes are the shift from Likely Republican to Lean Republican in Rep. Mike Bishop’s (R-Mich.) seat and Rep. Pat Meehan’s (R-Penn.) seat. Rep. Lynn Jenkins’s (R-Kan.) open seat was also moved to Lean Republican.

While these seats are still considered safer seats for Republicans to hold, a handful of others became slightly more favorable for Democrats including the districts of GOP Reps. Duncan Hunter (Calif.), Mia Love (Utah), Andy Barr Andy BarrMcConnell holds 12-point lead over Democratic challenger McGrath: poll Democrats fear 2016 repeat despite Biden's lead in polls Protecting COVID research at American universities from foreign hackers MORE (Ky.), Dave Brat (Va.) and Dan Donovan (N.Y.).

Only one ratings change favored Republicans: Rep. Kyrsten Sinema’s (D-Ariz.) open seat. The newsletter shifted it from Solid Democrat to Likely Democrat. Cinema is giving up the seat to run against vulnerable GOP Sen. Jeff Flake Jeffrey (Jeff) Lane FlakeJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Republican former Michigan governor says he's voting for Biden Maybe they just don't like cowboys: The president is successful, some just don't like his style MORE next year.

The ratings changes are good news for Democrats who will need to win 24 seats next year in order to take back control of the House, a tall order even if the political environment proves favorable.