Question: when was the let's move campaign launched
[{'answer': 'February 9 , 2010', 'provenance': [{'wikipedia_id': '28199652', 'title': "Let's Move!", 'start_paragraph_id': 4, 'start_character': 30, 'end_paragraph_id': 4, 'end_character': 49, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '28199652', 'title': "Let's Move!", 'start_paragraph_id': 4, 'start_character': 83, 'end_paragraph_id': 4, 'end_character': 644, 'bleu_score': 0.840958184557782, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15190567293097421227}, 'section': 'Section::::History.\n'}]}]