Marketing Week reports that both Labour and the Conservatives are calling people who have registered with the Telephone Preference Service. Whilst it's illegal for political parties to ask for funds or support from people who have opted out of unsolicited cold calling the politicians believe they have found some weasel loopholes.
The politicians claim that the calls are canvassing opinion which is allowed and that if the calls are made by volunteers rather than paid workers they're OK.
Given the strength of feeling about cold calls (particularly amongst those who have taken the trouble to opt out) and the general view of politicians, its hard to imagine a more stupid way of marketing yourself.
But maybe each party is ringing and pretending to be the opposition? Now that would be clever.