I know that one should never generalise from one canvass session.
I also know that my unexpected appearance on the doorstep may have a strange effect on the house-holder concerned.
It is, of course, well-known that my charm, sunny demeanour and general all-round people skills (note the repeated use of irony) will have a strangely persuasive effect on those subjected to its full force.
However, in the space of 90 minutes this evening I came across four people who had previously voted Liberal Democrat but were now undecided …..
Something strange is happening out there.