Pew has a new report. Money quote:

By nearly three-to-one (55% to 20%), Republicans approve of the military action Israel has taken in the Gaza Strip. Independents, by a smaller margin (44% to 29%), also approve of Israel’s actions. However, a plurality of Democrats (45%) disapproves of Israel’s military campaign, while just 29% express a positive opinion...

Those who are younger than 30 are less likely to sympathize with Israel than are older Americans. By 42% to 17%, more young people say they sympathize more with Israel than the Palestinians. Roughly half or more of those in older age groups sympathize more with Israel, while only about one-in-ten or fewer sympathize more with the Palestinians.

White evangelicals are the strongest non-Jewish supporters of Israel.