LAS VEGAS (AP) — Most of the GOP field will be in Las Vegas Tuesday for a presidential debate, but Mitt Romney and Ron Paul are the only Republicans who seem to be campaigning in Nevada in earnest.Michele Bachmann and Herman Cain were both campaigning in Arizona Monday. Rick Perry didn't hold any public events, though he does have staffers on the ground in Nevada and will speak Wednesday at a major conference. Rick Santorum canceled Nevada events in "solidarity" with the early states. He went to Iowa instead, where he's pinned his presidential hopes on the first-in-the-country caucuses.And former Utah Gov. Jon Huntsman is leading the charge to boycott the state entirely. He says Nevada's decision to move its caucuses to Jan. 14 is an affront to New Hampshire.