Ok, both Goldwater in 1964 and Wallace in 1968 rain very decisive campaigns.
Goldwater was willing to drag the Republican party towards a very conservative view. He was willing to divide his party much like Trump is. Some controversial statements that got Goldwater in trouble in 1964 would now find support in red parts of the country. On the most controversial issues, like his hard-line stance against immigration and the division of cultures sound very much like Donald Trump in 2016. Goldwater's stance on the 1964 civil rights act is a prime example. Arguing it constitutionally had some merit but in the end it was just wrong to prevent anyone from having the same civil rights. I don't think Barry Goldwater as a racist, just on the wrong side of what was morally right for its time.
In reality, George Wallace and Donald Trump have little in common. But what both were able to do was to tap into dark wellsprings of anger, hatred, frustration. I see Trump willing to point out our differences, feed on our fears and create division when in reality America should unite against a common cause. Banning someone on the basis of religion or kicking out millions who just want a good life like yourself is wrong. Don't get me wrong, things must improve and safety and wellbeing of the nation is a must. I think Trump is well ahead of Hilary on that, but does it need to be as extreme as his rhetoric?
Hope that helps with my comment, thanks for asking.