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In the final 72-hour frenzy before Election Day, Donald Trump will strategically sprint across key states, while Hillary Clinton is counting on star power to woo voters during this jam-packed weekend.

A Trump campaign aide told NBC News that a Michigan or Pennsylvania victory is the Republican nominee's best path forward. Trump will campaign in left-leaning Michigan Sunday evening, and two campaign aides said focusing on that state will give him flexibility to lose New Hampshire and Nevada

The Trump-Pence ticket, however, would still have to win Florida, North Carolina, Ohio and Iowa in order to reach 270 electoral votes.

Vice presidential running mate Mike Pence, who just completed a three-day streak of visits, will also head back to Michigan before polls close.

"We are wheel to wheel here in the state of Michigan, and we're going to sprint to the finish and take the checkered flag,” the Indiana governor said Saturday morning in Holland.

Obama is scheduled to campaign for Clinton in Michigan on Monday and will meet the Democratic candidate and First Lady Michelle Obama in Philadelphia for a rally.

In Pennsylvania, Clinton has maintained a lead in polling since the summer, but Trump campaign aides said Saturday they have new numbers that indicate the Republican nominee has eclipsed the Democratic ticket.

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The Trump ticket has more ground to make up on Clinton despite an uptick in its polling performance. A Detroit Free Press poll released on Friday still gave Clinton a four-point edge over Trump.

Meanwhile, on Saturday, Clinton leaned on the likes of Katy Perry, who performed at her rally in Philadelphia, and Bon Jovi, who took the stage with her running mate, Tim Kaine, in St. Petersburg, Florida. It was the second day the Democratic nominee has turned to celebrity supporters for an assist: Jay Z and Beyonce performed at a rally Friday in Cleveland.

"My personal favorite part was Beyoncé had her backup singers and dancers in pantsuits," Clinton said to laughter Saturday at a rain-soaked rally in Pembroke Pines, Florida.

The Clinton campaign on Saturday also released a new television ad featuring Perry’s song “Roar” that will run in 11 battleground states.

Trump has already had a busy weekend with a stop in Tampa, Florida, and an early afternoon speech in Wilmington, North Carolina.

Trump made a stop in Reno, Nevada, where he was whisked off stage after someone in the crowd shouted "gun." A man was detained but no weapon was found at the event, the Secret Service said. Trump resumed his speech. Trump went on to hold a rally in Denver Saturday night.

Trump was joined onstage in Wilmington by his wife, Melania Trump, who spoke to the candidate's character.

As Melania says Trump is loving he gives her a quick kiss. pic.twitter.com/fSuH0OUw1p — Ali Vitali (@alivitali) November 5, 2016

Running mate Pence stopped in Wisconsin and was joined by House Speaker Paul Ryan, Gov. Scott Walker and Sen. Ron Johnson.

The vice presidential candidate made his third visit in three days to Michigan. He then caught a flight to deliver pizza to volunteers in Richmond, Virginia, and to attend rallies at George Mason University and in Manassas, Virginia.

Trump, meanwhile, canceled his scheduled Sunday stop in Wisconsin, and Pence is unlikely to return to the state.

Related: Race to 270: 3 Paths to Victory for Clinton and Trump

Trump continues to suffer from a surrogate disadvantage as high-profile Republicans have shied away from publicly rallying for the polarizing candidate, meaning Trump and his vice presidential nominee are doing much of the heavy lifting. He has also called upon former vice presidential candidate Sarah Palin to hit the trail for him in the closing days of the campaign.

"We don't need Jay Z to fill up arenas. We do it the old-fashioned way. We do it the old-fashioned way, folks. We fill them up because we love what we're saying and you want to make America great again," Trump said during his Tampa rally, a sentiment he has reiterated.

Clinton has been able to roll out a robust roster of Democratic supporters, ranging from lawmakers to celebrities. Vice President Joe Biden, Bernie Sanders and Chelsea Clinton all hit the trail to stump for her on Saturday.

Recent polls have shown a tightening race just three days before the election. Clinton on Friday made a stop in Michigan — a state once thought to be solidly blue but surveys suggest is now a tossup state.

The Democrat has largely bypassed Michigan in favor of states with early voting.