How can bad paintings be good?

Here's a little light relief for a Friday afternoon: a website showcasing (if that's the word) bad paintings of Barack Obama. Apparently there is an ongoing wave of artistic representations of the US President which shows no signs of abating. I find these bad ones - and some are quite spectacularly awful - rather fascinating, more so perhaps than 'better' ones. I once visited the Nelson Mandela Museum in Umtata (near where he was born) and there were rooms of similarly bad but somehow touching portraits by children from all over the world.

I wonder if there is an equivalent phenomenon of portaits of Gordon Brown I don't know about?