[E. Pluribus Unum]

He knows he doesn't have a prayer of winning. It's not about winning.

It's about cashing-in on government-provided campaign funding for him and his cronies.

[tennmountainman]

“It’s about cashing-in on government-provided campaign funding for him and his cronies”

It is also about protecting “Enhancing His Brand”.
i.e. Make more money.
He does not have a prayer and he knows it.
He is despised by most conservatives.