Question:

About this Poll
The findings come from a Field Poll completed September 17-October 4, 2015 among 1,002 registered voters in
California, of whom 391 are consider likely to vote in next year's June Democratic presidential primary election.

Interviews were administered by telephone using live interviewers in English and Spanish. Individual voters were
sampled at random from listings derived from the statewide voter registration rolls. Once a voter's name and
telephone number had been selected, interviews were attempted with voters on their landline or cell phone depending
on the source of the listing from the voter file and the preference of the voter. In this survey 787 of the interviews
were completed with voters on their cell phones, while 215 were completed on a landline or other phone.

Up to six attempts were made to reach, screen and interview each randomly selected voter on different days and
times of day during the interviewing period. After the completion of interviewing, the sample was weighted to
align it to the proper distribution of voters by race/ethnicity and other demographic, geographic and party
registration characteristics of the state's registered voter population.

Sampling error estimates applicable to the results of any probability-based survey depend on sample size and the
percentage distributions being examined. The maximum sampling error for results from the Democratic primary
voter sample in this report is +/- 5.0 percentage points. These estimates are based on survey findings in the middle
of the sampling distribution (i.e., results at or near 50%). Percentages at or near either end of the tail of the
distributions (i.e., results closer to 10% or 90%) have somewhat smaller margins of error. There are other potential
sources of error in surveys of public opinion besides sampling error. However, the overall design and execution of
this survey sought to minimize these other possible errors.