How to get the Keyword Text from campaign negative report

I am currently doing the following query to get the negative keywords from a campaign:

report_query = ('SELECT CampaignId, Id, KeywordMatchType '

                    'FROM CAMPAIGN_NEGATIVE_KEYWORDS_PERFORMANCE_REPORT') 

I don't see a field KeywordText even though I see it in the adwords examples, is the a way to get the keyword text as well?

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