The RP lost the Hispanics votes for the future just like the votes under the civil rights movement for African Americans. Lincoln is way too far in the past for people to give a hoot about. The fact is the GOP can not get re-elected with just the caucasian votes. Conservatives are the poor, the working poor, and middle class, and affluent. Minority groups contains them too. If the GOP think it pointless to reach out to minority groups then it's their loss.
A person with principle will live by them and a person without principle will do whatever it takes to win.