The first evidence would be the fact that hush money payments are not illegal.
The second piece would be the fact that hush money payments are not campaign expenses even if they happened. A campaign expense is an expense that would not reasonably be made if there was no campaign. Multiple witnesses have testified that Trump was very worried about how Melania would feel about the infidelity stories. Hope Hicks, the darling of the left, testified that Trump told her to make sure she intercepted the newspaper before Melania got it when the story broke.
Witnesses have destroyed Michael Cohen's version of events. The testimony has been a complete bloodbath for the prosecution.
Inner City Press has been doing a good job of reporting on the testimony.