"But I have you on my side. Let’s show the SuperPACs that I’ve got the grassroots with me – and that they’d better pick a fight with someone else," Merkley adds.
That's likely why the Senator started fundraising efforts for his reelection campaign as early as April of this year. President Obama won Oregon with 54 percent of the vote, but a poll conducted earlier this month indicated 44 percent of Oregonians approve of the job he's done as senator. That's an improvement from the 37 percent who approved of his job in a June poll, but the newest poll indicates he could be vulnerable to a challenge: He leads every hypothetical Republican contender, but only leads former GOP Sen. Gordon Smith by 4 percentage points, and Rep. Greg Walden (R) by 5 percentage points.
Merkley had a little less than $500,000 cash on hand as of the end of November, far less than some of his fellow freshman Senators that could face challenges in 2014, including Sens. Al Franken (D-Minn.) and Mark Udall (D-Colo.), both of whom have more than $1 million cash on hand.
--This post was updated to reflect the most recent polling numbers.