One thing people misunderstand about third parties is that they don't need to win. If they're structured correctly (this is by far the most difficult bit), they can have significant political influence without ever winning a single election. For example, love him or hate him, Ralph Nader probably swayed the 2000 Election and had incredible influence over the outcome (for better or worse). Coming back to the Forward P…
The main issue is that third parties often have the opposite effect that their supporters want. They draw voters from the more aligned main party, causing that aligned main party to lose elections. Third parties hurt the interests of their own supporters. There are good reasons why the Democratic Party tends to support the Libertarian Party and the Republican Party tends to support the Green Party [1]. 1. https://www…
From the point of view of the third party supporter, this would be exactly what you would want.
In other words, an effective third party can be a great catalyst toward making some minor (or major) change in the most closely aligned parties.