Can't bear celebrities getting into politics - seems entitled to me. What do they actually know about how real people live?
Why is it entitled? They pay tax, vote, use public services the same as anyone else does. Yes, the amount of money they may have might mean they have have more options open to them than some people, but lots of non-celebrities also have the money to open up options for themselves.
Eddie Izzard has been involved in politics for a long time - this isn't a fad he has just decided to do for a bit of fun. He has run for similar positions in the past and not won, so his winning this time is unlikely to be because of his celebrity status. The voters on this occasion are labour party members not the audience of a reality TV show, so are likely to be voting for someone who they feel's politics best matches their own.
As for him not seeming very clever.... I'm not sure why that's relevant.
What would you suggest as an alternative? That everyone who wishes to run for a political position has to first sit some exams and can't earn over X amount? That's hardly democracy in action.
(And no I'm not on the same page as him politically and wouldn't vote for him for that reason)