PHILADELPHIA (CBS) — The Democratic front-runner in Tuesday’s Pennsylvania primary, Hillary Clinton, spent one last night campaigning in the courtyard of Philadelphia’s City Hall.

“I am absolutely convinced our best years are ahead of us,” Clinton told the crowd.

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That note of optimism was clearly an important theme. Secretary Clinton said it twice during her 20 minute speech before more than a thousand supporters, in which she both outlined her positions and excoriated the Republican candidates.

“When I hear the kind of reckless rhetoric coming from Donald Trump and Ted Cruz it’s deeply troubling,” Clinton said, “because it’s not only offensive, it’s dangerous.”

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Of her actual opponent in the primary, Bernie Sanders, she made only glancing references, never by name.

“It is not enough to diagnose our problems,” Clinton said. “We need to know how to solve them.”

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The front-runner’s prerogative, since most polls have her up over Sanders by double digits.