At first it looks like a poorly photoshopped, heavy handed metaphor for the election race, but on closer inspection there’s a lot more going on than that.
For intsance, from the knee down the Labour runner’s left leg is about 5 times bigger than his right leg. This would make it almost impossible to run in a straight line and explains Labour’s veering towards more right wing policies over the last few years.
Lastly, those racist fucks the BNP were of course represented in this metaphor by a white runner and last we heard he’s lagging a fair way behind. He’s expected to finish on The Times front page at some point over the weekend.