Is a second party possible in the United
States? The answer to that is not at the moment.
Right now there's only one
faction, and it's neither Democrats nor
Republicans.  It's actually moderate
republicans who are called democrats.
Today's democrats, so-called new
democrats, the core democratic party, are
what used to be called moderate
republicans.  The other faction is still
called republicans but it's not clear
that it's a political party in any
traditional parliamentary sense.  Its
commitment to its constituency, the
very wealthy and the corporate sector, is
so extreme, that it's only policies are to
try to undermine everything to serve
them.  That's not parliamentary politics.
So it's a one-party state with one party.  Kind of moderate republicans.
