As he inches toward the GOP nomination, Donald Trump is becoming more and more disliked among American voters. Donald Trump wasn't wildly popular to begin with. And now he's becoming even more disliked among American voters, creating a significant threat to his chances of winning the Republican presidential nomination. Trump is, by far, the GOP delegate leader — and the only candidate with a realistic shot at winning a majority of delegates before the July convention. But at the same time, nearly two-thirds of Americans view Trump unfavorably — and his image rating has declined since Republican voting began in...