It boils down to the demographic and ideological changes that the US is undergoing.
Thirty five years ago the frum world had a lot of clout .Secular politicians would come and speak by all sorts of frum dinners and events. (Chuck Schumer came to my YTV elementary school graduation thirty years ago. There is no way his replacement would either come or be welcome at such an event today) People like Reb Moshe Sherer had access to virtually all politicians. etc.
The reason for this shift seems to be that the American values have moved much further away from frum values over the past thirty five years. Thirty five years ago even non-Jewish politicians and most of their constituents still valued things like religion and family values. Thirty five years ago even secular Jewish politicians strongly identified as being Jewish and had empathy for the Jewish community. Frum Jews included.
Today however with the lurch to the left and progressiveness we no longer have common ground. A progressive politician who isn’t openly hostile and actively promoting policies that are adverse to the frum community is a good guy already.
A progressive politician who actively promotes policies that are good for the frum community simply doesn’t exist.