New campaign finance reports showed a national Republican group has spent more than $500,000 trying to re-elect Gov. Butch Otter in Idaho.
Much of that money has gone to television ads. The spending suggests the Republican governor faces a tougher than expected challenge this year from his wealthy Democratic opponent.
Democrat A.J. Balukoff has been running as a centrist businessman focused on education who backed Mitt Romney for president. It's an image the Washington, D.C.-based Republican Governors Association seeks to shatter in its just unveiled political ad.