During the last Republican party presidential candidate debate, the candidate who is leading the polls, Donald Trump, made a complete "asshole" of himself. "Asshole" is a "derogatory" (bad) word, meaning "stupid, idiot". Americans often use this word.
Trump, who is notorious for using bad language, spontaneous insults, discriminatory statements, outrageous comments etc., claimed that he is "well-hung". This is a slang, for a guy with a big penis. He also insinuated (suggest in an unpleasant way), that one of his opponets in the debate, Mister Rubio, did not have a big one.
Obviously, Donald Trump is not fit to be the president of the United States, should he get the Republican nomination and win the general election in November.
Up to now, many Americans have felt entertained by Mister Trump's rude, obnoxious, inflammatory remarks and the fact that he has promised to build a wall along the southern border of the United States to keep illegal Mexican aliens out. (V,C)
candidate who is leading polls 世論調査でリードしている候補
make a complete asshole of himself 自分の馬鹿さ加減を露呈する
notorious for 〜 〜で悪名高い、札付きの
spontaneous insults 無意識に出てくる相手への侮辱
discriminatory statements 差別的な意見/主張
outrageous comments とんでもない/非常識なコメント
fit to 〜 〜にふさわしい
should 〜 仮りに〜したとしても（仮定法）
up to now 今まで
keep illegal Mexican aliens out 違法メキシコ人を立ち入り禁止にする