If even 10% stay home, Hillary wins.
The same is true the other way, If Cruz takes the nomination in a manner that causes 10 % of the 18 million Trump supporters to fail to vote (~1.8 million) and losses the 6 million he brought in, the republicans go from ~67 million votes to just around 60~61 million.
Unity ticket sure would be nice,
Then Hillary wins, bring on the free stuff I am too old to care anymore.