Walmart heir Christy Walton will co-host a fundraiser for U.S. Vice President Kamala Harris, signalling the Democratic candidate's growing popularity among wealthy donors and business leaders. Tickets for the lunch reception to be held in Jackson Hole, Wyoming, on Sept. 15 range from $1,250 to $100,000 and will be attended by Michigan Gov. Gretchen Whitmer and former Montana Gov. Steve Bullock, according to the invitation. Walton, who is listed as a co-host of the event, had previously been one of the key Democratic donors urging President Joe Biden to drop out. She is worth $15.40 billion, according to the Billionaires Index.