Animosity between a House conservative and a prominent animal rights group has exploded into election-year fireworks in rural Iowa.

The Humane Society Legislative Fund has spent more than half of its political action budget so far this election cycle opposing a single lawmaker: Rep. Steve King (R-Iowa).

The group — the 501(c)(4) lobbying affiliate of the Humane Society of the United States — says King has turned himself into the chief foe of animal protection in Congress.