The most dangerous group in America...

Christian's United for Israel is a multi-denominational, largely evangelical christian organization, that supports Israel. In and of itself this doesn't seem to be such a bad thing given that a large part of the christian canon is Jewish in origin. The problem comes down to the eschatological beliefs of those who participate in this zionist meeting of minds. Far from plain old jewish zionism that asserts it's belief that Israel and its lands belong in jewish hands, specific portions of christian eschatology are prefaced by certain happenings in the middle east. Things like: armageddon, the reconstruction of the temple of solomon (the location of which is currently taken by the second holiest location to muslims, the Dome of the Rock. Obviously the temple destruction or control of this site would have to fall in jewish hands again.) etc, etc.. would have to transpire. Evangelicals usually adopt the Pretribulationist view that believes that the rapture will occur prior to the second-coming and ensuing violent build-up to the millenium of Christ's reign on the earth.

They propose a pre-emptive nuclear strike against Iran. Rhetoric from John Hagee, the organization's leader sums up their view.

Israel’s time of need is now. There is a new Hitler in the Middle East --President Ahmadinejad of Iran -- who has threatened to wipe out Israel and America and is rapidly acquiring the nuclear technology to make good on his threat. If we learned anything from the Holocaust, it is that when a madman threatens genocide we must take him seriously.

This and some other views are covered in some reporting by Max Blumenthal. Go read his article and watch the video here. You can also search for Rapture Ready on Youtube to find the video in question. Foundationally their support for Israel is only as an impetus to the tribulation period in their view of the end-times. They only support Israel in order to stir up the violence necessary for their end-times. In their terms... this is an apology for Judas. They are no better than him, as they betray the spirit of Christ's teachings in order to usher in hell on Earth.