The Hispanic population has been established in North America for over 400 years and has settled a root of power when they gained the ability to vote in 1965. 11% of today's eligible voters are of Hispanic/Latin ethnicity, an amount that could sway the end polls. In 2012, Obama won over 79% of the Hispanic vote, while Romney only had 27%, in he end results Obama won out by 3.9% Less than the whole of the Hispanic vote, If Romney had the Hispanic vote he could've won the election. The same goes for the preceding election with McCain, where Obama won out on the Hispanic vote. Having the Hispanic vote make or breaks the election for competing candidates. It's this revelation that altered how candidates rally voters and who they target for specific percentages.
https://www.washingtonpost.com/news/post-politics/wp/2015/10/22/angered-by-trump-and-cruz-hispanic-conservatives-plan-unprecedented-meeting/
http://nypost.com/2015/10/26/only-11-percent-of-hispanics-like-trump-poll/
http://www.cnn.com/2015/09/24/opinions/sanchez-hispanic-heritage-trump/
https://www.washingtonpost.com/news/post-politics/wp/2015/10/22/angered-by-trump-and-cruz-hispanic-conservatives-plan-unprecedented-meeting/
http://nypost.com/2015/10/26/only-11-percent-of-hispanics-like-trump-poll/
http://www.cnn.com/2015/09/24/opinions/sanchez-hispanic-heritage-trump/