Logroller

noun

1. In a sawmill, a steam-power machine for loading logs upon the saw-carriage.
2. One of a number of politicians in a legislative body, united by an agreement, implied or expressed, to further each the other's schemes in consideration of a return in kind; a person habitually addicted to political log-rolling.
3. One who engages in logrolling.
4. Someone who logrolls, some who competes in a logrolling.