I added up all the other votes. The tally is as of now:
The dumbest chicken was a tie between Leghorn and Silkie. They got 15 votes each.
2nd. Polish. They got 11 votes.
3rd. Orpington and Cornish Cross tied for third. They got 10 votes.
Sexlink got 5
Cochin got 3
Sultan, Nacked neck, and Easter-egger got 2 votes
Barnevelder, Wyandotte, Plymouth Rock, Ancona, Faverolle, Lakenvelder, and Old English Game got 1 vote each.
This poll is probably not totally accurate, because if you have not raised the dumbest chicken then you would think something else was the dumbest breed. It was just for fun! I will edit it if their are more responses. Thank you all for participating.