These thimbles are sold on eBay. They are not original political thimbles, but are really cheaply-made reproductions. I bought a set, though I was pretty dubious about their authenticity at the time. They were cheap enough then so I really didn't care, but now they're going for a BuyItNow! price of $22.00, plus $3.50 S/H.
Real plastic political thimbles are made of much thicker plastic, even the more recent ones. I don't know how Jesse Jackson's name is spelled on the original, but this set's thimble has it as Jessie. The man who sells these has loads of other political souvenirs up for auction . Knowing these are cheap repros, I would not trust anything else he sells.