During the course of this campaign, a quarter of Tories in East Renfrewshire have switched to voting Labour to back Jim Murphy against the SNP.
Polls by Ashcroft of the constituency at the beginning and end of April shows the Tory vote dropping by 25 to 20%, and the Murphy vote increasing from 31 to 36% – a direct transfer of Tory tactical votes to Labour.
The Tories willingness to back the leader of the Scottish Labour accounting unit is the starkest possible illustration of the collusion of Red Tories and Blue Tories. It comes on top of Miliband’s preference for a Tory government rather than a deal with the SNP. As I have been saying for almost a year, I view a Tory-Labour “grand coalition” as perfectly possible.