What's so special? A good chunk of the US population believes the Israelis were literally chosen by God over 2000 years ago to occupy that piece of land, and they're obligated to do whatever they can to help them.
There is more to it, not only that but they believe that the Jewish state of Israel is needed for Jesus to return to earth.
This belief comes from Thessalonians 2:1-4
"1 Now concerning the coming of our Lord Jesus Christ and our being gathered together to Him, we ask you, brothers, 2 not to be easily disconcerted or alarmed by any spirit or message or letter seeming to be from us, alleging that the Day of the Lord has already come. 3 Let no one deceive you in any way, for it will not come until the rebellion occurs and the man of lawlessness—the son of destruction—is revealed. 4 He will oppose and exalt himself above every so-called god or object of worship. So he will seat himself in the temple of God, proclaiming himself to be God."
So the "temple" is required for the anti-Christ to arise, and for Jesus to return.
Now as to if that actually means the physical Third Temple of Solomon... this is up for theological debate. Some Church Fathers held that the anti-Christ would indeed arise from a physical Third Temple. While other Church Fathers held that the 3rd Temple in Christianity was technically the Church, and so the anti-Christ would arise from her.
Either way, if you side with the first view there is no qualification for a state to be present in order to rebuild the physical Third Temple.
Protestant Evangelicals in America by and large take the first stance I mentioned, and are pretty stalwart in their belief the State of Israel is the vehicle through which this will be achieved.
For those who want additional information, it is called dispensationalism.
Evangelical beliefs and others start to be more of a political topic, subject to survey? A basis of the practice is that it is done in the open and lawfully, so Church leaders might be fairly plain about what they actually believe, when asked?
This story does not end well for Israel or the people who live there.
It looks to me that it is correlated with whatever this survey defines as "traditionalist": https://www.pewresearch.org/religion/2005/04/15/american-eva...
Traditionalist applies across denominations with different traditions and theology so no idea whether it has a consistent meaning.