RENO, Nev. — Dean Heller is spoiling for a fight.

The Nevada senator is the only incumbent Republican facing a real fight in November, hailing from a purple state and a regular top target of Democrats. Yet, he remains confident, maintaining he wouldn’t trade places with others in competitive races less than three months until his face-off with Rep. Jacky Rosen, D-Nev., as Democrats pin their hopes of retaking the Senate on defeating him.