Segnosaur
Penultimate Amazing
While Sanders may have been the most obvious case, there have been other cases. I am thinking about Joe Lieberman, who maintained a democratic membership but also flirted with the republican party. Plus you also have Trump, who prior to his current association with the Republicans, drifted between various Democrats and Reform party causes. And David Duke, who had run in both Democratic and Republican primaries. I could imagine some Democrats being concerned pre-2016 about a party hijack, or at least letting in candidates who could prove to be embarrasing.Not necessarily. I think 2016 is more likely to inspire such a decision instead of being subject to such a decision. I can't think of any event in the past 50 years that would be more likely to inspire a "candidates had to be long-term members of the party" rule than the 2016 primaries.
ETA: Also, forgot about Lyndon Larouche... who seemed to bounce back and forth between the Democrats and various 3rd parties. Ultimately his 1996 campaign was cut short, in part because the Democrats had a rule about candidates being a registered voter; Larouche, being a felon, would not qualify.
Even if Larouche (or Duke) were not viable contenders, I could imagine the Democrats wanting to set up rules to keep them from causing problems in the primaries. (Including rules about length of party membership)
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