They've stopped doing that because it doesn't win them elections. The roots of it go back to Nixon's southern strategy to split the Democratic party based on ra

They've stopped doing that because it doesn't win them elections. The roots of it go back to Nixon's southern strategy to split the Democratic party based on race, but the 80s also walked back alot of the strength of unions and removed other protections due to deregulation, and the 90s were how this all got finished off with the rise of talk radio and cable news dominating the conversation on the right. There should be room for a broader party that is pro-labor, but you would have to ditch alot of the links to civil rights or make a move to pick up the social conservatives in order to bring in many of the current GOP voters. It's possible, but I think the GOP as it currently exists needs to collapse before you can lose its grip on those voters.