On behalf of the University of Southern California Dornsife College of Letters, Arts and Sciences and the Los Angeles Times, Greenberg Quinlan Rosner Research, in conjunction with American Viewpoint, conducted a new survey among 1,500 registered California voters.
Los Angeles Times
- Bernie Sanders and Hilary Clinton in a tight race in California as the campaign batters her popularity - June 2, 2016
- Poll finds Senate hopeful Loretta Sanchez strong among Latino voters but few others - June 3, 2016
- Poll finds Californians are strongly in favor of state's minimum wage increase - June 9, 2016
- California Voters are becoming more concerned about healthcare costs than about whether they have insurance - June 10, 2016
- Californians' support of transgender bathroom access in schools is growing, poll shows - June 11, 2016
- Sanders in Dead Heat with Clinton in California before Primary - June 2, 2016
- Democrats Harris, Sanchez Share Big Lead in Senate Race - June 3, 2016
- Most CA Voters Back Minimum Wage Hike - June 9, 2016
- CA Voters Back Affordable Care Act But Have Concerns - June 10, 2016
- In a Big Shift, Voters Support CA Transgender Law - June 11, 2016
Greenberg Quinlan Rosner Research, in conjunction with American Viewpoint, conducted this survey on behalf of the University of Southern California Dornsife College of Letters, Arts and Sciences and the Los Angeles Times. These findings are based on a random sample survey of 1,500 (1,500 weighted) registered voters in the state of California, conducted from May 19 – 31, 2016. Interviews were conducted by telephone using live interviewers from Interviewing Services of America. Voters were randomly selected from a list of registered voters statewide and reached on a landline or cell phone depending on the number they designated on their voter registration. Fifty-five percent of this sample was reached on a cell phone. Up to five attempts were made to reach and interview each randomly selected voter.
The study includes an oversample of 400 known-Latino registered voters, with the total number of Latino voters interviewed at 489 (360 weighted). All interviews among known Latinos were carried out via telephone by bilingual Latino interviewers, and conducted in the preferred language of the survey respondent, English or Spanish. Overall, 40 percent of interviews among the known Latino sample were conducted in Spanish and 60 percent in English. The technique of using fully bilingual interviewers yields higher response and cooperation rates and is greatly preferred because it does not terminate calls with Spanish-language households and require a callback.
Upon completion of all interviewing, the results were weighted to bring the Latino oversample population into line with the racial and ethnic composition of registered voters in California. The data was weighted to reflect the total population of registered voters throughout the state, balancing on regional and demographic characteristics for gender, age, race, and party registration according to known census estimates and voter file projections from several distinct voter files.
The maximum sampling error for the overall sample of 1,500 registered voters is +/- 2.9 percentage points at the 95 percent confidence level. The margin of error for subgroups is higher. The margin of error for Latinos is +/- 5.0 percentage points at the 95 percent confidence level.
This study includes a subsample of 903 Democratic presidential primary voters (814 weighted). These voters are registered Democrats, plus registered NPP voters who report being almost certain to vote in the Democratic presidential primary contest. The margin of error for these “eligible Democratic primary voters” is +/- 3.7 percentage points at the 95 percent confidence level.
This study includes a subsample of 503 likely Democratic presidential primary voters (433 weighted). These voters are registered Democrats and NPP voters, who are considered likely to vote based on a combination of past vote history, self-reported vote likelihood, and voter registration status. The margin of error for these “likely Democratic presidential primary voters” is +/- 5.0 percentage points at the 95 percent confidence level.