This is my perception of where the bigger candidates lie in terms of personality typology according to Myers Briggs Type Indicator:
Nenshi:
ENTP
McIver:
ESFJ
Higgins:
ESFP
http://en.wikipedia.org/wiki/Myers-Briggs_Type_Indicator
The means by which they gather information (N/S) is probably the biggest difference between candidates.
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