From a proposed Californian law:
18320.5. It is unlawful for a person to knowingly and willingly make, publish or circulate on an Internet Web site, or cause to be made, published, or circulated in any writing posted on an Internet Web site, a false or deceptive statement designed to influence the vote on either of the following:
(a) Any issue submitted to voters at an election.
(b) Any candidate for election to public office.
EFF comments…
In other words, it would be illegal to be wrong on the internet if it could impact an election. The bill is unconstitutional under U.S. Supreme Court case law (see our opposition letter for more information on that), and likely to draw immediate and costly lawsuits if it is signed into law.
EFF: California Bill To Ban “Fake News” Would Be Disastrous for Political Speech »