You mean: "the Biden administration (the hard right-wing), the centre-right (Bernie Sanders and so forth), and the Corporatists, and even the Fascists, if they can play by the rules..."

How often do I have to say this? There is neither centre nor left in US politics, only rght, hard right, extreme right and people even Hitler would be uneasy about. You describe yourself as Conservative and Bernie Sanders as ultra-left. Yet on this side of the Atlantic, Mr Sanders would be a welcome member of Boris Johnsons' Cabinet. Even the legendary AOC, over here, would be no further left than the centrist Liberal Democrats. So unless your definition of 'Conservative' means either rigid Corporatist or frothing Fascist, you belong in the Democratic Party.

Also, in a democracy, the Government legislates and the Opposition opposes or tries to amend. If they can work together, then their ideologies are too close for there to be any point in elections.