Battleground versus Ignored

In 2016 there were 13 states in which both campaigns bought advertising or the final election result was within two percentage points on election day. In these so-called battleground states, 47.5 million out of 72.4 million eligible citizens voted, or 65.6%

But in the non-battleground states in 2016, 89.2 million out of 158.2 eligible citizens voted, or 56.4%. So when the campaigns advertised, opened local offices, tried to get out the vote, they drove participation up from 56.4% to 65.6%, an increase of 16.3%. 

An increase in voting of 16.3% when the campaigns seek the votes: a big number.