But the 45% party and the 10% party form a coalition because their platforms are more closely aligned to one another than either is with that of the second 45%

But the 45% party and the 10% party form a coalition because their platforms are more closely aligned to one another than either is with that of the second 45% party, right? Isn't that exactly what we have in our current 2-party system, with factions forming coalitions against the other groups that they most disagree with? Might the only difference be that, on one side of the Atlantic, the individual factions have explicit names while the coalitions go unlabeled, and on the other side of the Atlantic we explicitly name the coalitions while the factions they comprise go (mostly) unlabeled?