Maybe the thread title or people's talking points are getting confused.
Arizona will not cut off power to L.A. and has not threatened to. When the Los Angeles city councel (and Mayor) became one of the first government's to threaten boycotts and economic harm to Arizona it prompted a letter from a member of the AZCC. In it he went a little
Jules Winnfield , in his "Well, allow me to retort" style. The L.A. boycott bluff got called out for the hot air and bluster that it was.
Even as more cities join the PC parade, the public (including Democrats) support the Arizona law or at least the major provisions it contains. Both are playing politics and Arizona has the MSM and the Obama admin. against them. However, Zona does have reality (Obamabots keep admitting to not having read the bill) and the public on their side. The fight will last till November and beyond... like all the rest.
Broad Approval For New Arizona Immigration Law: Overview - Pew Research Center for the People & the Press