What is the sentiment of this news? Please choose an answer from {strong negative/moderately negative/mildly negative/neutral/mildly positive/moderately positive/strong positive}.
Text: Mary Kay Henry, president of the Service Employees International Union, or SEIU, joins CNBC's 'Squawk Box' to react to the historic unionization vote at an Amazon warehouse on Staten Island in New York City.
user
moderately positive
assistant