The "Long Tom Confederacy" is more hype by current academics than reality then. The so called "Long Tom Rebellion" was nothing more than a local Confederate supporter shooting off his mouth in support of Jefferson Davis in pro-Union Eugene.  The dude was arrested and his friends threatened violence to get him released.  Which he was because he was doing nothing more than exercising his right of free speech.

Oregon's Senator Baker and Union Colonel was killed at the battle of Ball's Bluff.  While Governor Whiteaker may not have been in support of sending troops east, they were hardly needed since the War Department planned for the Oregon Volunteer regiments of cavalry and infantry to replace the regular army Soldiers in Oregon and defend the state from foreign and domestic enemies.  And there was no problem getting Oregonians to serve in the regiments.

Oregon becoming a pro-slave state was never a real possibility, again more current hyper-ventilation by academics.