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on 31 May 1904 Churchill ‘crossed the floor’: he entered the Chamber, walked towards the Speaker’s Chair, bowed, and then turned right instead of left to sit on the Opposition benches, from which he would savagely attack the party he had just deserted. For the Tories he was now ‘the Blenheim rat’, and it did look as though he was leaving a sinking ship.
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Geoffrey Wheatcroft (Churchill's Shadow: The Life and Afterlife of Winston Churchill)