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 .
Bernie Sanders

Bitcoin hit a record high of $16 623 per coin on Thursday  December 7. Two years ago  the idea of buying the virtual currency even at that price was laughable. After a rapid rise in value in 2013  the cryptocurrency's value more than halved by mid-2015. At its lowest point  one bitcoin was equal to about $230. Given the currency's covert nature  the average person still may not understand how buying and selling actually works. Using the app Coinbase  which lets anyone trade bitcoins for a small fee  we decided to find out. A brief warning: If you're going to do this  tell your bank you're about to buy bitcoin. More on that later. And to read more about blockchain  the technology powering bitcoin  click here. View As: One Page Slides
This is what the Coinbase app looks like on an iPhone.
However  Coinbase's interface makes it simple to enter the basic personal information it needs to create your account.
The final step before entering my financial information was two-step verification for security  which  Coinbase  quickly sent to my phone.
To sell the bitcoin   Coinbase  only allows users to pair  their  bank account with the app; a credit or debit card won't suffice.
Since  Coinbase  wasn't linked to my bank account  the transaction needs a few days to process before the money is transferred.
Coinbase

Next thing. I wrote recently about answering a casting call for extras to portray hurricane refugees in a video for the Bill White gubernatorial campaign. I showed up and played along just to get an idea of what the experience would be like.
 You can see the video at tinyurl.com/28y8sa5. I'm in the second snippet  about 25 seconds in. My participation ends at about the 26-second mark. Good luck spotting me.
 Taken as a whole  here's the message: White's a weird-looking dude who is very  very short (at least he looks so in the photo of him with the 7-foot-6-inch Yao Ming) and who at least once attended an event with some Borat-looking folks and who tends to make babies cry (unexplained photo of a smiling White holding a crying baby).
 A current Perry attack ad twice uses a video clip in which White looks very shifty-eyed. And there's another ad that ends with a black-and-white mugshot of White  in which he looks like a guy trying to smile through his booking photo or a patient asking if he should be concerned about the oozing from his left eye. Way to take the high road  governor.
 Locally  the best example of this genre so far is an ad (tinyurl.com/26qx8rp) for Rep. Patrick Rose  D-San Marcos  showing GOP opponent Jason Isaac -- who looks downright presentable in photos on his campaign website -- in slow-mo  grainy action doctored to make it look like it might have been taken while Isaac was fleeing after robbing a 7-Eleven.

Bill White