Jews have disproportionate levels of soft power in the US. Israel receives billions in support every year. Anti Muslim propaganda is pushed out every year in Hollywood. The medias coverage of Gaza is essentially one big lie by omission. Many states pass laws aimed to deter criticism of Israel.
I don’t see any other group in America that receives this level of support.
I'm not an expert on US politics and the reasoning for why the US supports Israel. I do however think that it's sensible to see Israel, with its relatively free elections, women rights, entrepreneurship etc as a more natural ally to the US than other countries in the Middle East, regardless of the "soft-power" you're referring to. The fact that some of its enemies also threaten the US probably plays a role too.