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In a new poll on the eve of two crucial primary votes in Ohio and Florida, Donald J. Trump has a commanding lead among Republicans in California, which is the state with the largest single remaining source of delegates on the path to the Party’s nomination for President.

When matched with his three other contenders: Ted Cruz, John Kasich, and Marco Rubio, Trump wins the “closed” California Republican primary with 38.3% of the GOP vote, compared to 22.4% for Cruz, 19.7% for Kasich, and 10.1% for Rubio. Voters registering an “undecided” opinion were 9.6%. Trump’s almost 16% advantage over Cruz is statistically significant and well above the margin of error of the poll, which is 4.8%. The poll results demonstrate that Trump’s standing among Republicans in the Golden State has grown significantly in the last two months. (In January, in a similar poll using a smaller sample size, the Field Organization pegged Ted Cruz as the leader in California, 25% to 23% for Trump.) Trump’s lead is commanding in all four “Board of Equalization” districts across the state, suggesting if the election were held today, that he would win in virtually all of the state’s Congressional Districts and capture all of the state’s delegates.

A total of 172 delegates to the Republican National Convention are up for grabs in the 2016 California primary election, more than 7% of all delegates who will decide the next Republican Presidential nominee, and 14% of the delegates needed to win the nomination.

The poll was commissioned by Landslide Communications. This new Landslide Communication’s California Poll of Republican Presidential Preferences of likely Republican voters in the 2016 primary election is the second such poll to be released. In early February, 2015, Landslide released a similar poll showing Wisconsin Governor Scott Walker leading in the state, with similar results confirmed in a subsequent Field Organization poll a week later using a smaller sample size.

Poll Frequencies, NSON Opinion Research’s Summary, and Demographic Cross Tabs are available for download at the end of this article.

Further Details on Landslide’s California Poll appear below.

California’s importance in 2016 Presidential election to Republicans:

California is a decidedly “blue” state in which Democratic Governor Jerry Brown recently won re-election by over one million votes, bucking a national trend that favored Republicans. And a Republican candidate for President has not won the state of California since 1988.

However, because California is the largest state in the union by population, with 53 Congressional districts, California has a very large delegation up for grabs for GOP presidential contenders at the next Republican National Convention.

There will likely be a total of 2,461 delegates at the 2016 GOP Convention. California is allotted 172 of those delegates, about 7% of the total. Of California’s delegates, 10 are awarded to the candidate who wins the statewide vote. In addition, a candidate who finishes first in any one of California’s 53 Congressional districts is awarded 3 delegates. The state party chairman and two national committee members are also delegates. The winning margin at the Republican National Convention will be 1,230 delegates. Theoretically, a candidate who could sweep California’s Republican Presidential primary election could count on the state to deliver just over 14% of the total delegates needed for victory.

List of Presidential contenders in poll:

Poll participants were read a randomized list of the 4 candidates to choose from.

Poll questions:

The poll questions were prepared by James V. Lacy, Managing Partner of Landslide Communications, Inc. Landslide is one of the largest producers of election slate mail in California. Lacy is the author of the book “Taxifornia” and editor and contributing author of “Taxifornia 2016: 14 Essays on the Future of California” available at Amazon.com, and is a frequent guest commentator on California issues on Fox Business News Channel’s “Varney & Company.” Lacy is also an election law and nonprofit organization attorney through his law firm, Wewer & Lacy, LLP, and is a recipient of the American Association of Political Consultant’s “Pollie” Award. Lacy is not associated with any Presidential campaign. Landslide Communications, Inc., has a history of conducting polls in California, including presidential polling and in the 52nd Congressional District race in 2014 between incumbent Scott Peters and Republican challenger Carl DeMaio.

Interview list:

The list used to make the calls was based on a sophisticated, representative election turn-out model for likely Republican voters in the 2016 California Presidential primary election prepared by Political Data, Inc., located in Norwalk, a respected source of voter files.

To account for a slight bias in the delegate selection process that awards a small “bonus” pool of delegates based on the statewide result, the interview list was balanced for region by Board of Equalization District, with the two more Republican leaning BOE districts of four having marginally more interviews reflected in the statewide total than average, to most accurately reflect the opinion of California’s Republican population.

Interviews and data compilation:

The poll questions were completed by 407 likely Republican voters in the 2016 California Presidential primary election based on Political Data’s model. (The Landslide Communication’s sample size is 25% larger than the sample size used by the Field Organization for similar polling in California.) The sample size is considered large enough by NSON Opinion Strategy, a respected strategic public opinion research company based in Salt Lake City, Utah, to offer statistical significance in outcome, with +/- 4.8% margin of error at a 95% confidence level statewide. Telephone survey interviews were conducted statewide over two days from Wednesday, March 9th through Thursday, March 10th, by NSON Opinion Strategy.

A summary of the poll prepared by NSON, along with “frequencies” and “crosstabs” may be downloaded below.

For comment, please contact James V. Lacy at 714-878-6191.

James V. Lacy is publisher of California Political Review.

CA Rep Pres Pri – Frequencies

16′ CA GOP Presidential Primary Poll (March)

CA Rep Pres Pri – Crosstab Tables