This is one of the beginnings of the slippery slope. People decided that something was good and desirable and the Constitution was an impediment and changing it was just too long and too hard so they just ran around it.
I didn't know that! Now I'll have to look up where all these national holidays came from. Was wishing President's Day would go back to being Washington and Lincoln's birthday holidays without a King holiday. But now, maybe just to have Washington's birthday holiday back (also without King's holiday).