BOISE, Idaho (AP) — Former Republican presidential candidate Mitt Romney is campaigning in Boise on behalf of Republican Gov. C.L. "Butch" Otter, U.S. Sen. James Risch, R-Idaho, and U.S. Rep. Mike Simpson, R-Idaho. Romney said Thursday that he is endorsing the three because they are good conservatives, and because they were early endorsers of his presidential campaign. Romney also says Idaho as a state is a good example of how conservative principles can lead to economic prosperity. He also says he does not plan to run for president again. Romney lost to President Barack Obama in the 2012 election.