Arizona State Rep. Regina Cobb hadn't even formally introduced her app store legislation last month when Apple and Google started storming into the state to lobby against it.

Apple tapped its own lobbyist, Rod Diridon, to begin lobbying in Arizona. It hired Kirk Adams, the former chief of staff to Arizona Gov. Doug Ducey and speaker of the Arizona House of Representatives, to negotiate with Cobb on its behalf. It quickly joined the Arizona Chamber of Commerce, which began lobbying against the bill. And lawyers for both Google and Apple went straight to the Arizona House's lawyers to argue that the bill is unconstitutional.

"We went through a very difficult weekend where Apple and Google hired probably almost every lobbyist in town," Cobb said.

There's a reason Apple and Google care so much: Cobb's bill would allow app developers to use third-party payment systems to circumvent the 15% to 30% cut that Apple and Google take from app sales.