This week's dual by-election defeat saw Labour overturn a Tory majority in the northern Red Wall seat of Wakefield with a 12% swing.
Meanwhile, the Lib Dems used Mr Johnson's unpopularity in the south to turn Tiverton and Honiton yellow for the first time in almost a century with a 29% swing.
As the PM faces a "war on two fronts", the Sunday Mirror has identified the top 30 target seats for both opposition parties, where they are in second place and slim Tory majorities make them vulnerable.
All of them could be taken with a swing of 12% or less.
Thursday's double drubbing follows December's historic by-election victory for Sir Ed Davey's party in North Shropshire, where the Lib Dems defied all expectations to win the seat with a swing of 34%.
Diese Geschichte stammt aus der June 26, 2022-Ausgabe von The Sunday Mirror.
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Diese Geschichte stammt aus der June 26, 2022-Ausgabe von The Sunday Mirror.
Starten Sie Ihre 7-tägige kostenlose Testversion von Magzter GOLD, um auf Tausende kuratierte Premium-Storys sowie über 8.000 Zeitschriften und Zeitungen zuzugreifen.
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