Billionaire heiress Elizabeth Simons is pouring hundreds of thousands of dollars into the Democratic Party’s campaign to retake the House — even as she bankrolls the socialist causes and candidates that have Democrats’ establishment leaders increasingly on edge.Simons, who previously cut a $250,000 check to a super PAC backing Mayor Zohran Mamdani, has donated $354,000 to the Democratic Congressional Campaign Committee — the party’s chief House campaign arm — and thousands more to individual House candidates this election cycle. The donations, ironically, put Simons behind the same Democratic leadership forces trying to prevent the party’s increasingly powerful progressive wing from...