Love the Screen Name, and the sentiment ("the last really great president": I happen to agree. By comparison to the stellar accomplishments of Coolidge, even Ronald Reagan -- the last Presbyterian President in recent years -- was at best an "almost great").
However, as you surely know, you have spelled Calvin Coollidge incorrectly.
Yes, I am aware that the correctly-spelled "Calvin Coolidge" Screen-Name has already been appropriated by some Evolutionist who has scarcely posted since 2005, and even then only to tweak Creationists (hardly a worthy heir to the Coolidge name).
However, if you would LIKE to use the good name of our 30th President as your own electronic nom de guerre, I could humbly suggest an alternative to resorting to misspellings... you could use the man's full name, which was of course John Calvin Coolidge, jr. (Born on the Fourth of July, 1872, Coolidge was named for the Protestant Reformer John Calvin, of course).
Just a historical nitpick, from one Coolidge aficianado to another. Your choice of screen-names is your own, of course.
Best, OP
Thank you for your kind words. Maybe I will email the moderator and see if they will allow a name change. I have read several biographies of Coolidge.