The Idaho House State Affairs Committee has introduced HB 259. It says that any person who spends any amount of money whatsoever for a message advocating the election or defeat of any candidate, or any ballot measure, must identify the person responsible for the mssage. Furthermore, the political party of the person responsible for the message must be disclosed.
The bill covers newspapers, magazines, websites, text messages, yard signs, bumper stickers, pamphlets, display cards, posters, and buttons.
Here is the text.
The bill appears to be unconstitutional under the 1995 U.S. Supreme Court decision McIntyre v Ohio Election Commission.