Harry Harrison 
Stainless Steel Rat for President 
The Stainless Steel Rat Book 5

You can’t keep a good rat down, not one as slippery as Jim di Griz, alias the Stainless Steel Rat. And you can’t keep his nose out of trouble either.Jim and the lethal, luscious Angelina owe themselves a honeymoon and Paraiso-Aqui looks like the place. Settled long ago by voyagers from the southern continent of Earth (or Dirt as it was known) Paraiso is warm and easy. But all is not well in paradise. The serpentine tyrant General Julio Zapilote is about to sail back into office in another rigged election, and the chance to scupper him is just too good for Jim to miss. Corruption, bribery, graft and chicanery – for the Rat it’s just like coming home.