it is far more expensive to persuade an undecided or
skeptical individual (by one prominent Republican campaign strategist’s
reckoning, anywhere from $800 to $1,000 per voter) than to turn out one of
your own (roughly $20 to $30).
Can the Trump Campaign Rewrite the Story of the Trump Presidency? http://www.nytimes.com/2020/04/28/magazine/trump-campaign-manager-coronavirus.html
