The Labor Caucus under Hawke also developed a more formalised system of parliamentary factions, which significantly altered the dynamics of caucus operations. Unlike many of his predecessor leaders, Hawke's authority within the Labor Party was absolute. This enabled him to persuade MPs to support a substantial set of policy changes which had not been considered achievable by Labor Governments in the past. Individual accounts from ministers indicate that while Hawke was not often the driving force behind individual reforms, outside of broader economic changes, he took on the role of providing political guidance on what was electorally feasible and how best to sell it to the public, tasks at which he proved highly successful. Hawke took on a very public role as Prime Minister, campaigning frequently even outside of election periods, and for much of his time in office proved to be incredibly popular with the Australian electorate; to this date he still holds the highest ever AC Nielsen approval rating of 75%.