One group is what Karlyn Bowman, a psephologist at the American Enterprise Institute, rather awkwardly calls Some College.

ECONOMIST: The duck-hunting season begins

Whatever their motivation, psephologist Professor Paul Whiteley set out some of the hard demographic realities of the pensioner vote.

BBC: Going for grey

According to calculations by John Curtice, an academic psephologist, they would need to poll ten percentage points more than Labour at the next election to win an overall majority.

ECONOMIST: Last gasp for first past the post?

Yet according to John Curtice, a psephologist at Strathclyde University, one of Labour's worries in the election campaign is that its voting support is softer and less committed than the Conservatives'.

ECONOMIST: Gordon Brown made the best of a difficult business