An election improvement would be if each voter really got, rather than a
half vote, a complete vote, which could be cast either for (positive) or
against (negative) a candidate (or not at all) for a given elected
office.
As it is now, the voter is sometimes (often?) forced to vote *for* a
candidate that is perceived to be "the lesser of two (or more) evils."
With the "complete vote" the candidate with the least negative votes
wins.