Final answer:
The Party slogan commonly recognized from George Orwell's 1984 is "War is Peace; Freedom is Slavery; Ignorance is Strength." Such slogans are important tools in campaign and party propaganda, conveying core values and principles to the electorate.
Step-by-step explanation:
The Party slogan mentioned in Part I, chapter 3, of George Orwell's 1984 is not directly specified in the student's question. However, one of the well-known slogans of the Party in the novel is "War is Peace; Freedom is Slavery; Ignorance is Strength." These slogans are critical to the Party's propaganda and are used to control and manipulate the thoughts of the citizens in Oceania.
Political party slogans, while not typically as ominous as those found in 1984, play a significant role in real-world politics; they aim to encapsulate the principles or the focus of a campaign in a memorable and persuasive manner. As seen in historical campaigns, slogans such as "Leadership for the 60s" used by Kennedy or the "Great Society" used by Lyndon Johnson, they serve to communicate a candidate’s objectives and appeal to the voters' aspirations and concerns. Reflecting on party details observed during both the Democratic and Republican National Conventions, such as those given by Barack Obama or Mitt Romney, campaign slogans are a small yet powerful component of the overall political strategy.