convincing minority groups over time that Republicans have never abandoned their core principles of liberty, equality, and opportunity for all.
ie, lie like a dog? You need to read a little so you can get a clue. Start with googling the "Southern Strategy". After Truman put in the anti-lynching laws and desegregated the military the Republicans swooped in to pick up all the disgruntled white people. The work of LBJ wiht the Voting Right Act and the Civil Rights act intensified this effect.