I am no expert, but according to the Home Poker Laws FAQ:
In the state of Oregon, home poker games are classified as “social games”, which are legal according to the provisions of the Oregon Revised Statues. Home poker games are permitted so long as all players qualify as “a person who engages in any form of gambling solely as a contestant or bettor, without receiving or becoming entitled to receive any profit therefrom other than personal gambling winnings…”