...in eight of the last nine elections, the winner could have lost swing voters but won the race. In a second test, which examined voters who were undecided at a later point in the race, Campbell found that the last campaign in which they were decisive was 1960.
This article available online at:
http://www.theatlantic.com/daily-dish/archive/2008/10/do-swing-voters-matter/210317/
