How easy is it to change people’s votes in an election?
The answer, a growing number of studies conclude, is that most forms of political persuasion seem to have little effect at all. …
In fact, a recent meta-analysis of numerous different forms of campaign persuasion, including in-person canvassing and mail, finds that their average effect in general elections is zero. CONT.
Brendan Nyhan (Dartmouth), New York Times