It seems that the minhag of chapping shrayim from Rebbes is really "darkei Amorie" a goyishe minhag that the chassidim adopted! Here we see Congressman Brady chapping shrayim from the Pope!
When Pope Francis concluded his historic address to Congress on Thursday, dozens of lawmakers followed as he left the podium, hoping to clasp the hand or touch the garments of His Holiness.
Then there was Rep. Bob Brady (D-Pa.), who instead dashed to the podium to swipe the pope’s drinking glass.
The half-full glass of water has now become something of a holy relic for the congressman.
Brady took the glass back to his office, where he drank out of it, and held it up for his wife, Debra, and staff members so they could drink from it as well.