President Grant declared Christmas a Federal Holiday in 1970. Christmas, like Martin Luther King day, President’s Day, Columbus Dar etc. denotes the birth of a person Jesus Christ. Christmas commerorates the birth of Jesus Christ, thusly manger scenes etc depicting his birth should be allowed. Christmas does not denote Hannakka, Kwannza or any other celebration or religion. It simply is a Federal Holiday the celebrates the birth of great person.
How much more complicated can it be?
Barack didn’t “sign” the card. He autographed it.
Grant did a lot from the grave.