Johnson's pledge to serve a full term leaves him in a difficult position if the Tories are defeated in 2015.
Back in 2006 the PM attacked Israel's Lebanon offensive as "disproportionate".
The party cannot promise to eliminate the deficit, avoid further tax rises and cut taxes at the same time.
Party claims that total membership is nearing 200,000.
Labour stands to gain if the crisis in the health service becomes one of the major election themes.
But which will benefit the most?
The man charged with wooing voters is more likely to repel them.
It is less clear than ever what the Prime Minister would do with another five years in office.
The Conservatives need to woo 2010 Lib Dem supporters.
One Nation figures have tumbled from the stage.