It turns out running a poll to ask Twitter whether Ben Wallace should be prosecuted for treason is perhaps not savvy politics.Zia Yusuf. the Reform home affairs spokesman has today been slapped down by his leader Nigel Farage for labelling the former Tory defence secretary a "traitor" for allowing thousands of Afghans into the country. Farage has said the language is "over the top" and that Yusuf… 