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All three candidates spoke at the state GOP convention over the weekend, and California is the final major state with delegates needed to secure the GOP nomination up for grabs.

Trump and Cruz are campaigning in Indiana on the eve of that state's primary. Trump's rivals look to deny him delegates and hope to force a contested Republican National Convention in July.

Clinton beats Trump by 22 points, 56 percent to 34 percent, in a hypothetical head-to-head match-up. Meanwhile, Clinton defeats Cruz by 28 points and Kasich by 19 points.

A majority of registered Californians polled, 51 percent, had an extremely negative view of Trump, while 14 percent of registered voters had an extremely positive view of the businessman.

The survey of 2,400 Californians, including 2,011 registered voters and 529 likely GOP primary voters, was conducted April 27–30.