We hear that the U.S. Chamber of Commerce — which has emerged as a big-time player in the midterm elections — is about to drop at least $1.25 million in negative TV ads next week against Democratic Sen. Barbara Boxer next week.

Look for the spots to hit in LA, Fresno, Bakersfield, and Sacramento.

“We can neither confirm nor deny this,” the Chamber’s J.P. Fielder told us. But, he said, “All options are still on the table.” Asked whether the very close race — which Boxer is still slighty leads — is still in play, Fielder said: “Absolutely.”

That’s bad news for Boxer, who has already absorbed $3.2 million in Chamber TV ad pummeling. You can check out the chamber’s first — and possibly future — ad here. The C.O.C. has endorsed Republican Carly Fiorina as the “pro-business” candidate in the race.

Fiorina has only been hit with $122,357.88 in outside independent expenditure money, according to what the nonpartisan Sunlight Foundation can track down. Check out their new online tool — Follow the Unlimited Money Tracker — that allows users to, as Deep Throat/Hal Holbrook said, “Follow the money.”

For more on California’s Senate race — and the rest of the political scene — check out our elections page here.

For more election info, check out our elections page at SFGate.com.