Mark Cuban will campaign for Kamala Harris in 3 key swing states

• Mark Cuban is hitting the stump for Kamala Harris.
• Cuban is set to appear in three swing states in four days.
• There's been speculation that Cuban may be looking for a post in a Harris administration.

While former President Donald Trump turns to Tesla CEO Elon Musk, Vice President Kamala Harris has a billionaire of her own to help her campaign in its home stretch.

Harris will stump with the billionaire investor and former "Shark Tank" star Mark Cuban on Thursday in Wisconsin. Cuban is also set to host a town hall for Harris in Arizona on Saturday before linking up with Doug Emhoff, the second gentleman, to campaign in Michigan on Sunday.

The flurry of events shows how Cuban, long a vocal Trump critic, is making his views known in the final weeks before Election Day. It also serves as a quasi-rebuttal to Musk, who recently spoke at a Trump rally in Butler, Pennsylvania, and has said he'll host his events in what is considered the race's biggest swing state.

Cuban's campaign appearances come amid speculation that he might aspire to join Harris' administration if she wins the election.

Much has been made of Cuban's criticism of the chair of the Securities and Exchange Commission, Gary Gensler. Advocates of cryptocurrency have strongly objected to Gensler's regulation of the sector.

During a press call hosted by the Harris campaign, Cuban conceded that Gensler's actions were an open wound. And Cuban told Politico that he wouldn't "chase" the top role at the SEC but that if asked, he'd want to interview for it.

A minority owner of the NBA's Dallas Mavericks, Cuban is well-positioned to help Harris appeal to the business community and the young male voters the vice president's team hopes to reach. Before selling his majority stake in the team, Cuban gained fame for his bold presence on the sidelines at games, a break from the stodginess traditionally associated with sports owners. He also grew his profile over 15 seasons on "Shark Tank," an ABC reality-TV show focused on small-business owners trying to convince successful entrepreneurs to invest in their products.