Sen. Barbara Boxer (D-Calif.) is polling under 50% in a new Rasmussen poll (Jan. 14, 500 LV, MoE +/- 4.5%), which finds her leading three potential Republicans in general election matchups. Ex-HP CEO Carly Fiorina and ex-Rep. Tom Campbell, who just joined the race, perform nearly identical against Boxer, while conservative Assemblyman Chuck DeVore is just 6 points back. Boxer 46 - Fiorina 43 - Und 8 Boxer 46 - Campbell 42 - Und 9 Boxer 46 - DeVore 40 - Und 10 Boxer, running for her fourth term, fails to exceed 46% against any of the three Republicans -- not a good sign for any incumbent. Forking out $14 million in 2004, Boxer doubled her opponent's spending and won by 20 points. The seat hasn't been held by a Republican in 42 years. Always up for Change, I got this food for thought from Carly:

Dear Fellow Californian, During these tough times, families and business are doing the hard work of trimming budgets and tightening belts, and we rightfully expect the same from our leaders in Washington. However, this Sunday, the U.S. Senate voted to pass a $1.1 trillion omnibus spending bill that includes average discretionary spending increases of 12 percent and billions of dollars in wasteful earmarks. Not surprisingly, Barbara Boxer voted to support this bill. In fact, Barbara Boxer has never met a spending program she didn’t love. As I discussed with CNBC’s Larry Kudlow recently, she habitually votes for more government spending, higher taxes and policies that do not encourage job creation. California deserves better representation in Washington, and in 2010 we have the opportunity to make a real change; but I need your help. I hope you’ll get involved with my campaign today – click here to sign up to volunteer. With warm regards, Carly Fiorina