If Mueller is going after Podesta, it would be the democrats calling for his firing. They are not.
There is zero evidence of any kind leading to Russian collusion with Trump at this point. Its all FBI, Hillary, Podesta and the DNC. The two indictments are likely Manafort and Podesta. I doubt they have enough on Manafort to make anything stick.
All trails lead to Democrats at this time. I don’t see Comey getting out of this without an indictment somewhere along the line.