Various media outlets are reporting the jury found Paul Manafort guilty on 8 (of 18) charges including filing false tax returns. The jury "hung" on the other 10, and the judge declared a mistrial on those.
The jury took three days of deliberation to reach the verdicts they returned. However, it is likely most of that time was spent arguing about the 10 charges upon which they could not agree.
President Trump says he feels sorry for his former campaign manager, but is not quoted as saying Manafort was innocent. If Manafort in fact was trying to cheat the government (that's you and me) out of taxes he legitimately owed, and got caught, then he needs to do the time.
The misdeeds happened years before he was campaign chairman and had nothing whatsoever to do with Russian collusion. Thus, no pardon is warranted.
The worst you can say of Trump is that he chose a campaign chairman who was effective in the role, but had in times past not always been ethical. However, it is unlikely any background investigation private citizen Trump could have undertaken would have revealed Manafort's tax fiddles.
Manafort's mistake was moving out of the shadows of his former "international man of mystery" role. He knew his tax returns wouldn't bear close scrutiny so the harsh glare of a presidential campaign was the last place he should be.
