[kabar]

A new party could endorse Reps who are onboard with the party line. In NY, the Conservative Party endorses Reps. It would force some Reps to seek the endorsement of the new party.

First, try to take over the GOP. If that fails, a new party is the only option save not voting at all.

[DanZ]

In NY, the Conservative Party endorses Reps.

While N.Y. does have the Conservative Party and they do put up some candidates for N.Y. state offices only one was elected to Us. House or Senate and only for ONE Six year term

James L. Buckley 1971-1977 Conservative

Now looking at the N.Y. Senatorial history I see MANY third parties.

For states with OPEN primaries the option of multiple parties may very well have the same results as N.Y. State