text: Robert De Niro upset with Teamsters President Sean O'Brien for not endorsing Kamala Harris.
  #ThursdayThoughts #ThursdayMotivation https://t.co/MQTC71rHMV
justification: The post expresses Robert De Niro's disappointment with a Teamsters leader for not endorsing Kamala Harris, which implicitly supports Biden's administration and its allies, indicating a pro-Biden sentiment.