The Cook Political Report has shifted several House races toward the Democratic Party ahead of November's midterm elections, the nonpartisan elections analyst said Friday.

A number of House Democrats had their seats shifted to the left by Cook, while the report says a number of Republicans could now face higher chances of defeat in November.

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In total, 13 races were shifted by Cook to the left in the latest rankings, including those involving Reps. Tom MacArthur Thomas (Tom) Charles MacArthurRepublican David Richter wins NJ primary in race to challenge Rep. Andy Kim What to watch in New Jersey's primaries on Tuesday Republicans plot comeback in New Jersey MORE (R-N.J.), David Valadao David Goncalves ValadaoEx-GOP Rep. David Valadao up 11 points over Democrat TJ Cox in California House race: poll Republicans uncomfortably playing defense House Democrats target Midwestern GOP seats MORE (R-Calif.) and Robert Pittenger Robert Miller PittengerBottom Line North Carolina reporter says there could be 'new crop' of GOP candidates in 9th Congressional District race North Carolina board calls for new election in contested House race MORE (R-N.C.), who all saw their districts move from "likely" Republican to the more vulnerable category of "lean" Republican.

Cook also shifted some races involving Democratic incumbents, including Reps. Josh Gottheimer Joshua (Josh) GottheimerCentrist House group offers bipartisan COVID-19 relief deal Hillicon Valley: Lawmakers introduce resolution condemning QAnon | US Cyber Command leader vows to 'defend forward' in protecting nation from cyberattacks House Democrats request briefing on seizure of terrorist cryptocurrency assets MORE (D-N.J.) and Sean Patrick Maloney (D-N.Y.), from "likely" Democratic to the "solidly" Democratic category.

One big issue the analysis says Republicans will face is Pennsylvania's congressional district map, which was recently redrawn by the state's Supreme Court despite protests from state GOP leaders. The new lines caused Cook to shift a number of districts further to the left.

"Republicans desperately need to catch some breaks to offset the new Pennsylvania map," Cook Political Report House editor Dave Wasserman wrote.

"In this difficult environment, the [National Republican Congressional Committee] and the Congressional Leadership Fund have no choice but to run against Nancy Pelosi Nancy PelosiTrump puts Supreme Court fight at center of Ohio rally CDC causes new storm by pulling coronavirus guidance Overnight Health Care: CDC pulls revised guidance on coronavirus | Government watchdog finds supply shortages are harming US response | As virus pummels US, Europe sees its own spike MORE and seek to individually disqualify Democratic nominees with negative ads over the summer and early fall — before those nominees can introduce themselves — in order to hold onto their majority," he added.

Democrats currently have an 8-point advantage over Republicans on a generic House ballot, the Cook report notes, and a recent Morning Consult poll showed President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE with a 41 percent approval rating with 54 percent of those surveyed disapproving of his job as president.

Democrats need a net gain of 23 seats in the midterms to retake the majority in the House.