The same Arizona group that took down the state’s leading immigration hard-liner is now gunning for its best-known lawman.

Fresh off a successful drive to oust Republican state Senate President Russell Pearce this month, leaders of Citizens for a Better Arizona announced this week that they plan to form a “citizens posse” to challenge Maricopa County Sheriff Joe Arpaio in his 2012 re-election bid. Sheriff Arpaio, who has carved out a national reputation for his no-nonsense treatment of lawbreakers in his county and for his running battles with the Obama administration and immigration advocates, is serving his fifth four-year term.

The group also is considering a recall election against Gov. Jan Brewer, a Republican, although organizers said they will do so only if at least 5,000 volunteers sign up online to circulate petitions.

“The main focus right now is Joe Arpaio. We’re looking at a bunch of different options to get rid of him,” said Chad Snow, chairman of Citizens for a Better Arizona.