Original sentence: STV advocates argue that, by requiring a candidate to appeal to the supporters of other candidates for their second and further preferences, it reduces adversarial confrontation, and indeed, gives a substantial advantage to candidates who broaden their appeal by being not only collegial but as open-minded and flexible in their principles as they can manage
Edited sentence: STV advocates boast that, by requiring a candidate to appeal to the supporters of other candidates for their second and further preferences, it reduces adversarial confrontation, and indeed, gives a substantial advantage to candidates who broaden their appeal by being not only collegial but as open-minded and flexible in their principles as they can manage