There is a bit of skill involved in Blackjack, and a lot in of it in Poker. Some slot machines also allow you to manually stop the reels in a way that can influence the outcome, though I don't think they are common in US casinos.
The laws are usually the opposite: games of chance are more tightly regulated than games of skill.
It's the other way around, if a game can be shown to be skills based, they don't fall under gambling regulations. This is why a lot of gambling type games that issue tickets and target kids are legal.
video poker, blackjack, and poker can be made to have positive expected value with enough skill. Also roulette I suppose, if you go down the Thorpe and Shannon route of putting a computer in your shoe.
The laws are usually the opposite: games of chance are more tightly regulated than games of skill.