This situation can be said to be a sentence or a paragraph. It depends on the specific context and expression.

Generally speaking, if the election manifesto is simple and clear, it can be expressed clearly in one sentence, so it can be said to be a sentence. Some simple slogans or slogans, such as "serving the people" and "making our city better", can be regarded as a one-sentence campaign declaration.

However, if the campaign manifesto is more detailed or complicated and needs more explanation and explanation, it can be said to be a paragraph. Some detailed policy propositions, policy plans or personal experiences may take some time to express clearly.