It’s a big complicated world, and one where a US Presidential Election is taking place. Welcome to reality.
To the outside world we would wonder how any sitting president would NOT win.
The current guy has been doing the job for 4 years.
The opponent didn't exist until a month or so ago.
He didn't have the support of most of his own party, but now they are supposedly all cheering for him.
And somehow he has to convince a majority to vote for him in 6 months.
The other problem is he looks like a high risk Covid case.