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Sanders showed up for the ceremony dressed a little bit more sensibly than some others - including Tom Hanks, who looked freezing - by wrapping up warm.
After all, temperatures in Washington, D.C. were around zero degrees Celsius, and he's a 79-year-old man. It makes perfect sense he would want to stave off the cold.
However, there's no stopping the internet meme train, and thousands of people have edited Bernie into a whole heap of unlikely situations, sitting cross-legged with his warm winter coat and knitted mittens on.
Well, appearing last night of Late Night with Seth Meyers, Sanders lifted the lid on his outfit choices, and it's hardly as considered an approach as the one taken by Lady Gaga - famous for her outlandish and interesting fashion sense - who appeared to sing the US national anthem at the event.
He was just trying not to get chilly, which seems absolutely fair.
Speaking to Meyers, Sanders said he'd seen the memes and explained: "I was just sitting there trying to keep warm, trying to pay attention to what was going on."
However, there is a bit of a story behind the now-iconic mittens, it turns out.
The Vermont Senator revealed the mittens were made for him by a school teacher, who has since had a lot of attention for her creations.
Sanders continued: "What was really nice, Seth, is the woman who made the mittens, she is a schoolteacher [and] is a very, very nice person.
"And she's been somewhat overwhelmed by the kind of attention that is being shown to her mittens."
As for the main event, a slightly strange inauguration ceremony saw Biden installed as the 46th President of the United States in front of a small crowd, limited by the restrictions in place to prevent the spread of coronavirus.
Donald Trump didn't bother to show up either, although that has less to do with the ongoing pandemic.
In a speech to the country, Biden talked about how 'democracy had prevailed' after troubling times in the USA over the past few weeks and months since the election.
He said: "A new America has risen to the challenge today. We celebrate the triumph not of a candidate, but of a cause, the cause of democracy.
"The people, the will of the people has been heard and the will of the people has been heeded.
"We've learnt again that democracy is precious. Democracy is fragile. At this hour, our friends democracy has prevailed."
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