Secret or not - he certainly did Trump a solid by not actively campaigning for Kommie.
Or did he do her a favor? She was better off with Diaper Joe staying in the White House with his ice cream.
But he did do America a favor in endorsing her and transferring his stench to her, though she already had it.
I think she never wanted to campaign. She probably expected he might step aside in his second term, and then she would be POTUS.
When the Dem party pushed him aside, she had to build a campaign only a few months before the election. She had to know it was a long shot.
Or, maybe she never really wanted to be POTUS. Maybe she only wanted to be VP.