Q: Given a document, find the main entity about whom the author is writing. Write the full name if mentioned in the text. Note that URLs in the text have been replaced with [Link].
Bernie Sanders helps celebrate free City College tuition . 
With all the fervor of a revival meeting , about 700 people at City College of San Francisco today cheered U.S. Sen. Bernie Sanders and the supervisor who helped make tuition at the college free to city residents . 
I want to use my life to help other people , like Bernie ," Headrick said .
A:
Bernie Sanders