"In terms of party affiliation, red and blue are divided over blue and
white: 73% of Republicans sympathize more with Israel while only 44% of
Democrats do."
From http://www.i24news.tv/en/news/israel/politics/37434-140717-survey-majority-of-americans-support-israel-over-the-palestinians
It's easy to see which side is pro-Israel, the Republican party, and which side has no clue.