Many U.S. states allow for legal home games (not raked) among friends or family. Other states don't allow them.
Lawmakers in "illegal" states would need to be motivated to change the existing law. In short, they'd need to get something or see some benefit to changing the law in states where home poker is illegal. They'd need a pretty good reason to change the status quo.
And like all politicians, they want to know, "What's in it for me?'
That can be, "What's in it for my state?" (such as increased tax revenue) or "What's in it for me personally as a politician?" (votes from the masses, or better yet, votes from wealthy, powerful donors or organizations backing a change in the law to legalize home poker.)
One of the problems you'll find is that the casino gaming industry (generally) opposes legalization of home poker. They want to be "the only game in town." So if you want to play poker for money, you have to do it inside their casino. And they donate large sums to politicians and have powerful, effective lobbyists, paid for by all the money we lose playing at the casino, even though we all say we win all the time.
Another barrier to legal home poker in many states would be organizations that claim to treat problem gambling and gambling addiction (and make their money from it) They strongly oppose any relaxation of gambling laws anywhere. They'd be perfectly happy if every casino shut down. No horse racing. No sports betting of any kind. No Powerball, Mega Millions, or other lottery tickets. No scratchers. No 50/50 for your local fire company.