Donald Trump has a fight on his hands in 2020 - he's lost a major selling point

Donald Trump never stopped campaigning - he actually filed for re-election on his inauguration day.

But if the 23 Democrats who want to beat him get to have launch parties, so does he.

His most devoted fans have been buying hats, attending rallies and handing over their cash throughout his two years in the White House.

Diehards came to Orlando from far and wide - some queued overnight for the big event - so how's that old 2016 devotion holding up?

The short answer is that the devotion is holding up well. One attendee told me that Trump has "saved masculinity". Another assures me that "everyone is happier".

Thankfully, Mr Trump has never tested his theory that he could shoot people in the street and still enjoy the devotion of his fans.

Here is where you get the sense there might be some truth in it.

The people who have come to this arena don't need a new game plan or fresh policies.

They've got nostalgia for 2016 - the year they felt acknowledged. Which is lucky because aside from the new additions of "best economy in America's history" and "the Russia witch-hunt" - the script is the same.

Old classics like "drain the swamp", "build the wall" and even "lock her up" (no Hillary Clinton is not running in 2020) put the crowd in raptures.

Pantomime boos ring out as he bashes the media and his rivals.

"Our political opponents look down with hatred on our values and with utter disdain for the people whose lives they want to run," he said to a packed arena.

But he can no longer play the maverick outsider card - as president he's now the ultimate insider.

And he has a campaign to match.

In 2016 it was him and a handful of advisers buzzing around on his plane. Now it's a huge - well funded machine with data driven, targeted outreach.

The latest Florida Quinnipiac poll says all six Democratic frontrunners would beat him in the sunshine state - ruining his chances of a second term.

But the polls hold little credibility among Mr Trump's crew - after all, they all predicted Hillary would win.

But with the platform of a prospering economy, most incumbents would be gliding towards a second term.

Despite the bravado - Donald Trump knows he's likely to have a fight on his hands.