First lady Michelle Obama Michelle LeVaughn Robinson ObamaMichelle Obama: 'Don't listen to people who will say that somehow voting is rigged' Michelle Obama and Jennifer Lopez exchange Ginsburg memories Social media platforms put muscle into National Voter Registration Day MORE, fresh off a fiery campaign speech many are calling among the best of the year, will take the case for Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE to the traditionally red state of Arizona on Thursday.

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Obama will headline an early-vote rally in Phoenix, where she will "lay out what is at stake in November” and urge Arizonans to cast early ballots for the Democratic ticket, the Clinton campaign announced Monday.

It’s another sign of the campaign’s efforts to make a play for Arizona, which has gone Republican in four consecutive presidential elections.

The Clinton campaign is turning to the first lady, who as emerged has her most powerful surrogate.

Obama’s takedown of Trump last week for boasting about his sexually aggressive behavior toward women earned praise from political strategists as one of the most effective stump speeches of the 2016 campaign.

They also lauded her address at the Democratic National Convention in Philadelphia.

The Clinton campaign is looking to use its financial advantage over Trump to make him spend time and money defending reliably Republican territory, including the Grand Canyon State.

It plans to spend an additional $2 million in the state on television and digital ads, as well as direct mail, campaign manager Robby Mook said Monday.

The campaign already has 32 offices and 160 staffers on the ground there.

Sen. Bernie Sanders Bernie SandersButtigieg stands in as Pence for Harris's debate practice Bernie Sanders warns of 'nightmare scenario' if Trump refuses election results Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (I-Vt.), Clinton’s chief opponent during the Democratic primaries, on Tuesday will headline campaign rallies in Flagstaff and Tucson.

The campaign hopes that Sanders can motivate young voters to turn out for Clinton, who has struggled to generate enthusiasm among the voting group.

And former first daughter Chelsea Clinton on Wednesday scheduled to stump for her mother at Arizona State University in Tempe.

— Jessie Hellmann contributed.