Não consigo fazer o crosstab de um DataFrame gerado por pivot

votos2 = pd.DataFrame(
    {
        "PARTIDO": [
            "PT", "PT", "PT", 
            "PSDB", "PSDB", "PSDB",
            "AVANTE", "AVANTE", "AVANTE"
        ],
        "CARGO": ["Prefeito", "Vereador", "Deputado", "Prefeito", "Vereador", "Deputado", "Prefeito", "Vereador", "Deputado"],
        "VOTOS": [3000, 2300, 5000, 4321, 3546, 8456, 2467, 2348, 4523],
    }
)


votos2_pivot = votos2.pivot(index='PARTIDO', columns='CARGO', values='VOTOS')
votos2_pivot

percent = pd.crosstab(votos2_pivot['PARTIDO'], votos2_pivot['CARGO'], normalize=True) * 100
percent

Erro:

---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
/usr/local/lib/python3.7/dist-packages/pandas/core/indexes/base.py in get_loc(self, key, method, tolerance)
   3360             try:
-> 3361                 return self._engine.get_loc(casted_key)
   3362             except KeyError as err:

4 frames
pandas/_libs/hashtable_class_helper.pxi in pandas._libs.hashtable.PyObjectHashTable.get_item()

pandas/_libs/hashtable_class_helper.pxi in pandas._libs.hashtable.PyObjectHashTable.get_item()

KeyError: 'PARTIDO'

The above exception was the direct cause of the following exception:

KeyError                                  Traceback (most recent call last)
/usr/local/lib/python3.7/dist-packages/pandas/core/indexes/base.py in get_loc(self, key, method, tolerance)
   3361                 return self._engine.get_loc(casted_key)
   3362             except KeyError as err:
-> 3363                 raise KeyError(key) from err
   3364 
   3365         if is_scalar(key) and isna(key) and not self.hasnans:

KeyError: 'PARTIDO'