The Fundamentalist Christians think these organizations are run by Satan himself. I seriously doubt they would want anything to do with them.
However, there are manypeople that belong to the Freemasons in the U.S. There are Masonic Temples everywhere. And I know from first-hand experience that many of these people include both conservatives and liberals, or Democrats and Republicans.
As for George Bush, I have yet to find any sound evidence that he is a Freemason or supports them, but I am still open-mindely searching.
From my own research of the Knights Templar, I learned that the Freemasons are an "off-shoot" of the Knights.