Minnesota Democratic Rep. Ilhan Omar underperformed in the 2020 vote compared to President-elect Joe Biden by the largest percentage in the country, according to election analysis newsletter The Cook Political Report.

Omar received 64% of the vote in Minnesota's 5th District while Biden received 80% -- the largest gap in election performance between a Democratic representative and the Democratic presidential nominee in the U.S., according to Cook Political Report editor Dave Wasserman. 

"In fact, I'm not aware of anywhere near this severe an underperformance for any other House *candidate* in the county, let alone an incumbent," Wasserman wrote in a Wednesday tweet.

Omar beat Republican challenger Lacy Johnson by about 39 points whereas Biden beat Trump in the same district by 62 points, according to Wasserman. 

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The soon-to-be second-term representative, who is one of four progressive congresswomen who refer to themselves as "The Squad," has pushed back against claims that progressives cost Democrats a higher-than-anticipated number of seats in the House. 

While Democrats will maintain control of the House, their majority will shrink by at least six seats starting on January 3, making it the thinnest in decades.

At the same time, Democrats picked up just one seat in the Senate, where control hinges on two runoff races in Georgia on January 5. If Democratic candidates win both of those races, they would secure a 50-50 split, with Vice President-elect Kamala Harris able to cast a tie-breaking vote.

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In the week since the election, Democrats have traded blame over who's ultimately responsible for the lackluster showing. Moderates have pointed fingers at their colleagues who embraced the "defund the police movement" and for not pushing back harder against socialism. 

Fox News' Megan Henney contributed to this report.