How many votes will Trump give up by not running a professional campaign? A lot.

So what is the implication for Trump if he doesn’t have a full-fledged field organization? Fowler suggested thinking through the math like this.

Imagine you have a place where 50 percent of the voters support Trump and 50 percent support Clinton. If equal proportions of Trump and Clinton supporters vote, the candidates would obviously tie with 50 percent of the vote each.

Now suppose, for example, that 55 percent of Trump supporters vote but 62 percent of Clinton supporters vote — that 7-point effect again. Now Trump’s share of the vote is 47 percent. The math is: (.55*.50)/[(.55*.50)+(.62*.50)]. In other words, Trump’s disadvantage in campaigning turned a tie into a 6-point defeat.