A boy whose letter to President Trump made national headlines last month reportedly wanted a pro-Trump cake for his birthday party, but his mother was unable to find a baker willing to fulfill the order. At the July 26 White House press briefing, Press Secretary Sarah Huckabee Sanders read a letter from a boy named Dylan who said Mr. Trump was his favorite president. When she later released the letter publicly, the boy’s last name was blacked out. The only identifying clue was that everyone called him “Pickle.” The media scrambled to verify the letter’s authenticity, and the next day,...