On Wednesday, Guido reported that 3,500 Conservative Party members had signed a petition calling for Boris to be allowed to compete in the leadership contest. Since then, that number has tripled, with 10,000 fully paid-up Tories now adding their names to the list, and presumably ruining the CCHQ inbox. As Rishi and Liz take to the campaign trail, this demographic may well prove difficult to ignore. It’s already over 20% of Boris’s stonking majority from the last leadership election…