If you run for office as a member of a political party, then switch parties AFTER you're elected and in office, you should have to pay back every single campaign donation you got under penalty of Bait And Switch Fraud laws.
@Stonekettle I get your point, but it’s a slippery slope problem- what happens when the party is really on the wrong track, and to serve the public interest you need to stand against (whatever the issue is)? This kind of think can EASILY be weaponized.
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Then you leave the party and join the leaver.
And request that all of your donations to the party be refunded.