I really like this answer.
My top priority in this election is anti-corruption (which includes electoral reform, as I see it). My biggest issue with the top moderates is their current interpretation of the playing field as it stands. Buttigieg and Biden aimlessly, hopelessly, looking for cross-partisan appeal. Klobuchar is only marginally better on this front, primarily focusing on her electability in red areas. The only moderate I've really seen advocate for prosecuting corruption in the Trump Administration is Harris, who is now out.
The remaining candidate who is strongest on this front is unequivocally Warren, with Steyer and Bernie taking rather aggressive positions as well.
If you think this is an important issue, I don't know how you can stand behind the moderates that we have. Buttigieg and Biden can not try to appeal to Trump voters will also being open to prosecuting Trump administration officials. Klobuchar, as a former prosecutor, may have a better hand here, but I haven't seen any aggression from her.
Election reform was HR-1, a done deal as soon as the Senate and POTUS change hands.
My preferred candidate ideologically is Senator Warren. Yes, she is the candidate most vocal about prosecuting Trump. Unfortunately, I just don’t think her outcome vs Trump would be any different than Clinton. Grabbing power from Trump and McConnell is the most important issue for me this cycle.