More simple:

Old conservative values are replaced by liberal values.

Media demonizes conservative party (trashing liberal values)

Liberal party becomes more radicalized to differentiate itself from the new liberals (conservatives).

Introduce new party to split the vote even more (npd)

New parties are hyper radicals and are tests to see how well their initiations are doing with the newer voters.

All parties are now compromised for communist take over. Media continues to advance the party switch. Which is why they pound the table to support an idea like Kamala Harris would be a fitting pick for a conservative leadership