ORLANDO, Fla. - The number of radical-right hate and militia-type "patriot" groups in the United States, which peaked in 2012 after four years of explosive growth, fell significantly last year due in part to the mainstreaming of right-wing ideas, a civil rights group said Tuesday.The Alabama-based Southern Poverty Law Center released its annual Year in Hate and Extremism report, which tallied 939 active hate groups and 1,096 patriot groups in 2013, for a total of 2,035, which the organization said remained a relatively high number historically. It represented a 14 percent decline over the 2,367 groups counted in 2012.The drop came as mainstream politicians began co-opting more right-wing ideas into state legislation which face constitutional challenges, Mark Potok, a senior fellow at the center, said in a teleconference with reporters."We might be swapping terror and other criminal behavior for some really terrible laws," Potok said.He cited as an example a law passed by the Republican Arizona state legislature last week which would allow businesses to discriminate against gay people or others on religious grounds. Republican Gov. Jan Brewer has until Saturday to decide whether to sign the bill into law and is under pressure to veto it.The Southern Poverty Law Center defines hate groups as those with "beliefs or practices that attack or malign an entire class of people, typically for their immutable characteristics."Race or skin color, religion and sexual orientation top the agenda for many of the groups.