Rubio 12 (dropped out 3/15)
Poll dates, March 6-15, 2016. 321 likely California Republican primary voters, error margin 7.3, "Trump leads likely Republican voters in every demographic and ideological group."
3/24/16, "California poll: Trump leads GOP; Clinton, Sanders close," Politico, Nick Gass
"Donald Trump leads among likely California Republican primary voters months ahead of the state's June 7 contest, while Hillary Clinton and Bernie Sanders are within single digits, according to the results of a survey from the Public Policy Institute of California released Wednesday evening.
The survey was conducted from March 6 to March 15, the final day of Florida Sen. Marco Rubio's campaign. Rubio is thus included in the overall results, which find Trump with 38 percent support, followed by 19 percent for Texas Sen. Ted Cruz and 12 percent each for the Florida senator and Ohio Gov. John Kasich. Roughly 10 percent said they would vote for someone else, while 9 percent said they did not know.
The poll was conducted with the support of the James Irvine Foundation, surveying 1,710 adults across the state with an overall margin of error of plus or minus 3.6 percentage points. For the 1,385 registered voters surveyed, the margin of error is plus or minus 3.9 percentage points. For the 1,039 likely voters, the margin of error is plus or minus 4.4 percentage points, while the margin of error for the 529 likely Democratic primary voters is plus or minus 6.2 percentage points and the margin of error for the 321 likely Republican primary voters is plus or minus 7.3 percentage points."
"About the poll," ppic.org
"Findings are based on a telephone survey of 1,710 California adult residents—half (852) interviewed on landline telephones and half (858) on cell phones—from March 6–15, 2016. Interviews were conducted in English or Spanish, according to respondents’ preferences."
3/23/16, "Trump Leads with 38 Percent, Clinton Has 48 Percent Support among Primary Likely Voters," press release, PPIC.org
Trump up since Jan. 2016 poll: Reuters
"PPIC poll showed an increase in support for Trump when compared with a poll by the Field Research Corporation in January."...
3/24/16, "California Republicans lean to Trump but dislike candidate choices," Reuters, Sacramento
(4th parag. from end): "The PPIC poll showed an increase in support for Trump when compared with a poll by the Field Research Corporation in January. In that survey, Trump and U.S. Senator Ted Cruz of Texas were in a statistical tie at roughly 25 percent each. Since then, however, several candidates have dropped out."...