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> The opposite would be ideologically weak parties doing a form of clientelism that would change according to the trends of the day.

Like the Southern Strategy, the Blue Dog Democrats, Tea Party, and Donald Trump (party-switcher).

Look at the radical positions calling themselves "conservative" today, getting more extreme since the 1980s when religous extremists stated taking over the Republican Party.

One-third of US voters are Independent not registered to a party.

The US electoral system forces to parties, but those parties change and are sometimes replaced.