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Hillary Clinton finds herself in two front campaign battle against Donald Trump and Bernie Sanders.

CLEVELAND, Ohio -- Hillary Clinton gave Donald Trump a beat down in her San Diego speech Thursday, but may find herself beat by Bernie Sanders in Tuesday's California primary.

Recent polls show either Clinton or Sanders with slim leads that are within the margin of error, making the race a virtual dead heat. If the actual primary results match the polling, Clinton and Sanders would split the 475 delegates up for grabs.

Clinton has a delegate lead of 1,769 to Sanders' 1,501. Adding super delegates, Clinton's total balloons to 2,313. Clinton is 70 delegates short of what she needs for the nomination.

Even if Clinton ends up winning enough delegates for the nomination Tuesday, a Sanders victory in California will be a psychological blow for her campaign and gives Sanders more justification to stay in the race through to the convention.

The California primary is open to independents, who have boosted Sanders to victory in other states with open primaries. Sanders hope is to win California and do well in the other five remaining primaries and use those performances to try and convince super delegates to switch their support to him. The campaign will argue they have momentum and point to polls showing Sanders performing better against Trump.

Sanders will face an uphill battle trying win over those super delegates. Clinton's speech Thursday likely reassured Democrats that she's more than capable of effectively taking on Trump. And there's the perception that the reason polls show Sanders performing better against Trump, is that Sanders has benefited from not being the target of negative Trump attacks. Also super delegates are usually members of the party establishment, who likely resent that Sanders is still in the race attacking Clinton more than he is Trump and the issues.

Clinton can have the nomination clinched on Tuesday but still find herself unable to focus all her time and financial resources against Trump as she fights on a second front against Sanders.

Who would've thought that in June it would be Trump on his way to a nomination coronation and Clinton being awaken by 3 A.M. phone calls about the Sanders insurgency?