I like the voting system proposed by L. Neil Smith:
for every elected position, have a box for “None of the candidates are acceptable”.
Toss them all out and offer a new slate of candidates in the run off.
Then again, a negative vote option has its attractions.
For each candidate, have “For” and “Against” boxes.
You only have one vote in each race, but they subtract the “against” votes from the “for” votes.
Pretty much eliminates the possibility of “landslide Mandates”, but also pretty much requires a runoff.
Anyone who gets a negative total should reconsider trying to hold a public office.