This is a preview of the eighth installment of '16 And President, the Huffington Post series that takes you behind the scenes for a day in the life on the campaign trail with the candidates running for president.

PORTSMOUTH, N.H. -- He may be a big underdog against Democratic front-runner Hillary Clinton, but Sen. Bernie Sanders (I-Vt.) hasn't let the challenging odds stop him from drafting what would be his first speech as president.

During an interview this week on a jam-packed day of campaign events around the New Hampshire Seacoast region, HuffPost asked the 2016 Democratic White House contender if he’s been preparing himself mentally for the possibility that he could become president.

“Have I started writing my inauguration speech, as opposed to the speech I have to give tomorrow?” Sanders replied. “Look, the answer is yes. It is a very sobering thing to be thinking about oneself as president of the United States and the enormous responsibilities that go with that.”

Though he trails Clinton in the polls nationally and in every other state, Sanders has led the former secretary of state in several recent New Hampshire surveys.

Watch the video above for a preview of the latest installment of the HuffPost series, '16 And President.

Story by Scott Conroy

Video produced by Jon Strauss

Cinematography by Jon Strauss and Sam Wilkes

Associate production by Audrey Horwitz