Chrissie Thompson, and Sharon Coolidge

Cincinnati

Hillary Clinton will campaign Monday in Cincinnati with progressive U.S. Sen. Elizabeth Warren of Massachusetts – marking Clinton's first public appearance in Cincinnati this election cycle and her first campaign stop with Warren, a possible vice presidential pick.

Clinton will also appear Sunday night without Warren at a twice-postponed fundraiser at Cincinnati Mayor John Cranley's home, with contribution levels ranging from $1,000 to $33,400.

On Monday, Clinton and Warren will appear at 10:30 a.m. at the Cincinnati Museum Center at Union Terminal. The two women "will discuss their shared commitment to building an America that is stronger together and an economy that works for everyone, not just those at the top," Clinton's campaign said in a statement. Tickets to the event are available at hillaryclinton.com/events.

Clinton and her supporters have touted Warren's endorsement as the former first lady seeks to unite Democrats after a long primary battle with U.S. Sen. Bernie Sanders of Vermont. Sanders' progressive ideas won support, and primaries, all over the country. But Clinton won more delegates in primaries and won the support of most of the party's superdelegates, emerging this month as the presumptive Democratic nominee.

Warren, a longtime progressive leader, waited until this month to endorse the former secretary of state over Sanders. She could help Clinton pull more Sanders supporters to her side.

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"Elizabeth Warren campaigning with her is a sign the party is united behind Hillary," Cranley said Wednesday. "It helps articulate the differences between the campaigns," he said, given the reticence from some Republicans to back presumptive nominee Donald Trump. Some Republicans are exploring ways to craft rules for the GOP convention that could let delegates vote for someone besides Trump, which could put his nomination in question.

Sanders originally spoke of launching his own convention fight, but has since backed away from that notion, instead seeking to fight for progressive ideals in the party platform and in Clinton's positions.

Warren's support of Clinton, and her potential presence on the Democratic ticket, could make Clinton more friendly to progressive ideas – in appearance, at least, and, depending on how close the two become, potentially in reality.

Warren's aggressive critiques of Trump, including via Twitter battles, also have stoked speculation about her standing in the race for the vice presidential nod. Veep candidates often are counted on to lob many of the campaign's attacks on the other party's presidential nominee. Trump has responded by referencing Warren's struggle in her 2012 Senate campaign to prove her Native American ancestry.

Warren topped the short list reported this week by the Associated Press, citing unnamed Democratic sources, along with U.S. Sen. Tim Kaine of Virginia and Housing and Urban Development Secretary Julian Castro. Labor Secretary Tom Perez, Sen. Sherrod Brown of Ohio and Rep. Xavier Beccera of California could also be among those being considered, according to CNN.

The Republican National Committee on Wednesday mocked Warren, a champion for anti-Wall Street causes, for campaigning with Clinton.

"This event will complete one of the biggest sellouts in political history given that Hillary Clinton is everything Elizabeth Warren supposedly stands against," RNC spokesman Fred Brown said in a statement. "Watching Elizabeth Warren defend Hillary Clinton’s refusal to turn over her Wall Street speech transcripts will be as priceless as the accounts of her attending fundraisers with the same hedge fund managers she built a career demonizing."

Warren has some strikes against her in the veepstakes: She has been critical of Clinton, including in a book, and the two have not been close. Yet in the past, candidates have moved past similar tensions. George H.W. Bush called Ronald Reagan's economic plan "voodoo economics." They were White House partners for eight years.

While Warren is a progressive, she can't bring racial or generational diversity to the ticket. And Massachusetts, Warren's state, isn't considered a swing state in presidential politics.

It's clear swing-state politics loom large in Clinton's strategy: Her visit to Cincinnati next week will be her third to Ohio since becoming the presumptive Democratic nominee. She traveled to Cleveland last week for a speech responding to the Orlando shootings and Columbus on Tuesday for a speech declaring Trump's ideas on the economy as fodder for another recession.

Clinton's presumptive Republican opponent, Trump, visited Southwest Ohio twice during the GOP primary season, but has yet to return to Ohio since losing the state's primary to Gov. John Kasich. He also has yet to hold a fundraiser in the state, although Cleveland industrialist Ed Crawford has agreed to back Trump and to raise money for the Republican grassroots effort in Ohio, and major Cincinnati players in GOP fundraising also have expressed interest in contributing to Trump's campaign.

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Clinton's fundraiser Sunday, an invitation to which was obtained by The Enquirer, is chaired by Cranley and his wife, Dena, and by Allan and Jennie Rosenthal Berliant. Allan Berliant is the CEO of Hyde Park's Best Express Foods. They are members of the National Finance Committee for Secretary Clinton as well as for President Obama in 2008 and 2012.

So will Clinton sleep over after the event at the mayor's home?

"I offered and told her she'd love my wife's french toast," Cranley joked.

USA Today's Heidi Przybyla, Cooper Allen and Eliza Collins contributed to this report.