According to Wikipedia (and my personal understanding) - yes, you can.
Employee contributions to the state fund are deductible as state
IRS piece on this is pub 17.
Contributions to state benefit funds. As an employee, you can
deduct mandatory contributions to state benefit funds withheld from
your wages that provide protection against loss of wages. For example,
certain states require employees to make contributions to state funds
providing disability or unemployment insurance benefits. Mandatory
payments made to the following state benefit funds are deductible as
state income taxes on Schedule A (Form 1040), line 5.
Alaska Unemployment Compensation Fund.
California Nonoccupational Disability Benefit Fund.
New Jersey Nonoccupational Disability Benefit Fund.
New Jersey Unemployment Compensation Fund.
New York Nonoccupational Disability Benefit Fund.
Pennsylvania Unemployment Compensation Fund.
Rhode Island Temporary Disability Benefit Fund.
Washington State Supplemental Workmen's Compensation Fund.
Note that while CA SDI is deductible - VDI is not.