"Buckley rule" meaning in English

{
  "etymology_text": "After William F. Buckley Jr., who stated the rule in connection with National Review magazine.",
  "forms": [
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      "form": "the Buckley rule",
      "tags": [
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      "expansion": "the Buckley rule",
      "name": "en-prop"
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  "lang": "English",
  "lang_code": "en",
  "pos": "name",
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          "langcode": "en",
          "name": "US politics",
          "orig": "en:US politics",
          "parents": [
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            "United States",
            "Society",
            "North America",
            "All topics",
            "America",
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          "source": "w"
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      ],
      "glosses": [
        "The rule of supporting the most right-wing viable candidate for a given office."
      ],
      "id": "en-Buckley_rule-en-name-hKK8JSo2",
      "links": [
        [
          "support",
          "support"
        ],
        [
          "right-wing",
          "right-wing"
        ],
        [
          "viable",
          "viable"
        ],
        [
          "candidate",
          "candidate"
        ],
        [
          "office",
          "office"
        ]
      ],
      "raw_glosses": [
        "(US politics) The rule of supporting the most right-wing viable candidate for a given office."
      ],
      "synonyms": [
        {
          "word": "Buckley's rule"
        }
      ],
      "tags": [
        "US"
      ],
      "topics": [
        "government",
        "politics"
      ],
      "wikipedia": [
        "National Review",
        "William F. Buckley Jr."
      ]
    }
  ],
  "word": "Buckley rule"
}

{
  "etymology_text": "After William F. Buckley Jr., who stated the rule in connection with National Review magazine.",
  "forms": [
    {
      "form": "the Buckley rule",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "def": "1"
      },
      "expansion": "the Buckley rule",
      "name": "en-prop"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English proper nouns",
        "English terms with non-redundant non-automated sortkeys",
        "English uncountable nouns",
        "en:US politics"
      ],
      "glosses": [
        "The rule of supporting the most right-wing viable candidate for a given office."
      ],
      "links": [
        [
          "support",
          "support"
        ],
        [
          "right-wing",
          "right-wing"
        ],
        [
          "viable",
          "viable"
        ],
        [
          "candidate",
          "candidate"
        ],
        [
          "office",
          "office"
        ]
      ],
      "raw_glosses": [
        "(US politics) The rule of supporting the most right-wing viable candidate for a given office."
      ],
      "tags": [
        "US"
      ],
      "topics": [
        "government",
        "politics"
      ],
      "wikipedia": [
        "National Review",
        "William F. Buckley Jr."
      ]
    }
  ],
  "synonyms": [
    {
      "word": "Buckley's rule"
    }
  ],
  "word": "Buckley rule"
}