Thursday’s presidential debate: A make-or-break moment in U.S. election? [Video]

It’s uncommon for a sitting U.S. president to hunker down for a full week’s worth of election planning in the wooded retreat at Camp David.

But that’s where Joe Biden’s been.

Then again, there’s never been a presidential debate quite like the one he’s been preparing for, scheduled for 9 p.m. ET Thursday night.

Two unusually unpopular candidates, Biden and Donald Trump, locked in a close race, will meet in an abnormally early debate, three months sooner than they’re typically held.

It is a unique chance for voters to assess them for long, unimpeded stretches — Biden requested, and Trump accepted, rules to limit heckling and interruptions.

Trailing slightly in most surveys, Biden appears keen on resetting the trajectory of the race by proposing a debate this early, under this format.

With polls having barely budged a point or two since last year, this is regarded as a rare scheduled event with the potential to shift the campaign. 

“The most important 90 …