Use a wedge issue on which public opinion is against the GOP to provoke the far left into attacking:
Men (50% of voters);
Christians in general (female Christians another 20%);
People who live in certain states (lots more voters).
Divide. Win.
cnn.it/2vWQvYQ
If the other side is sufficiently stupid that strategy works every time.
The more emotional and the less rational people get the better for him.