In the 1956 Grand National, Devon Loch held a five-length lead over his nearest challenger and appeared to be coasting towards an easy win.But with just 40 yards to go the horse inexplicably jumped up into the air and bellyflopped.Since then the name Devon Loch has been synonymous with the act of clutching defeat from the jaws of victory. And it's a name that comes to mind when you look at the Conservatives' General Election campaign so far. Just a couple of weeks ago the Tories appeared to be...
