Johnson, Corbyn and Swinson were all rated as less effective leaders than Vladimir Putin

Mean effectiveness score

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0

2

4

6

Winston Churchill 7.8

Nelson Mandela 7.69

Barack Obama 7.15

Margaret Thatcher 6.39

Angela Merkel 6.28

Vladimir Putin 5.51

Emmanuel Macron 4.89

Tony Blair 4.64

Boris Johnson 4.63

Nicola Sturgeon 4.6

Nigel Farage 4.36

Jo Swinson 4

Donald Trump 3.84

Theresa May 3.57

Jeremy Corbyn 3.16