Why do political leaders seem better when they step down?

I note you didn't mention the messianic Tony Blair!

I agree generally!

Because they don't have that much power over you any more?
I know Ed's still an MP, but just one out of all the Labour MPs.
If he stands at the next election, that might have done him some good.
Have you looked at it on twitter, and the comments under it? Some excellent ones.

Because they can be more relaxed , Brown was personable before becoming PM, whilst PM and after, I think it was such a pity he couldn't do tv, he has a great sense of humour and is so caring . I have heard the same said of Major, I was told .thatcher was no different off camera

I would agree that Blair might be the exception that proves the rule!

Blair is the exception I agree.
Even Brown's best friend wouldn't say he was personable when he was PM. He was positively twitchy, gave nervous uncertain smiles at awkward moments and just looked uncomfortable. He is a nice man and a god politician but he wasn't a charismatic PM.

Ed's new bacon sandwich photo.
twitter.com/TheLastLeg/status/850460357042855936
Wonder how many votes that would have got him?

Have there been any Tory politicians on The Last Leg?
Not that I want them on, but I can't recall any.

Boris went on (but Boris goes on anything) They kept inviting Cameron, but he never took up the offer (can't think why)

Probably because they can relax - personally I can't think of any politician, present or past, who I would trust to sell me a used car!