Whatever he is in real life - and all the virtues you attribute to him Iam 64 are all the virtues of a man lacking in charisma and very worthy.
But in politics, as far back as you go, it is the charismatic and/or the rogues that win hands down over the worthy. Lord Palmerston, Disraeli, Lloyd-George, Thatcher, Blair.
A party is viewed through its leader, and if the leader comes over as dull and boring, that is how the party is seen.
There is a real difference between how we like to think people vote and how they ought to vote, and how they do and leaders who cannot come over to the electorate as having a strong and distinctive personality are death to their party.
At the end of day people are attracted to a rogue, especially a loud noisy ebullient one and have a respect for one that somehow always gets away with it. This applies on ordinary life. How often do you here people describe someone, a local man, or a neighbour, that leads his life on the edge of the law being described as 'a lovable rogue'.