Miliband vs Johnson on Marr this morning is interesting viewing. A case study in what a lightweight Johnson is - his mooted coronation post election is far from his Imo.
http://labourlist.org/2015/04/ed-miliband-rattles-boris-johnson-on-the-marr-sofa/
http://labourlist.org/2015/04/ed-miliband-rattles-boris-johnson-on-the-marr-sofa/