The Economist: Getting the Question Completely Wrong
This passage here tells you everything you really need to know:
Why is America so much more pro-Israeli than Europe? The most obvious answer lies in the power of two very visible political forces: the Israeli lobby (AIPAC) and the religious right.
Don't just take my word for it. Read the rest of the article. But I'll bet you could write most of it almost verbatim without reading it. As an added bonus, the writer mentions the Qana 'massacre' (nope, didn't see that coming) which looks more and more like this season's Jenin every day.
Why is America more pro-Israeli than Europe? What a silly question. They'd be better off asking, Why is Europe more anti-Israeli than America? The answers (a burgeoning ungovernable Islamic underclass, and the total dominance of cultural marxism in the political and media cultures) would be far more enlightening. But somehow it's okay to pee on the parade of some sets of religious believers (evangelicals, Jews) but doing it to others is 'racist' or 'Islamophobic' or something.