A political party is a coalition of interests designed to convince a majority to trust it enough to let it govern. The Progressive Era in its aim to neuter the constitutional speed bumps to majoritarian democracy pushed for democratic primaries. Initially the parties retained some ideological commitment, but in the age of instant outrage media, they have descended into tribal warfare where emotions rule over ideas. The two sides do not share common information or common narratives that define us as a nation.  There is no mere disagreement on how we arrive at common goals; we no longer agree on who we are.