The new Field poll in the California Senate race shows Democrat Barbara Boxer leading Republican challenger Carly Fiorina by just three points, 47 to 44. And if those numbers weren't worrying enough for the 3 term incumbent, there's more:

Boxer's slight numerical lead masks potentially serious problems for the senator, starting with how 52 percent of the respondents hold an unfavorable view of her.

At the same time, her job approval rating is among the lowest that Field has measured for her since she was first elected to the Senate in 1992: 43 percent of registered voters disapprove of her performance while 42 percent approve. Among likely voters, 48 percent disapprove and 42 percent approve.

Field Poll director Mark DiCamillo called the results "very ominous" for Boxer.

The Field Poll is just one of four such polls taken in the last six weeks showing the same thing: Boxer is at just 46.0% in the RCP Average, leading Fiorina by an average of just 4.5 points.

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