What specific or tangible outcomes do you aim to achieve to further the campaign goals? Ideally, objectives should be strategic, measurable, achievable, realistic and time-specific (SMART). Objectives are based on your situational analysis (looking at the range of potential issues), critical path (how can each issue be resolved) and organisational considerations (which issues do we have the capacity to tackle and which fit our organisation the best?). A clearly defined objective makes for a motivated constituency and successful campaign.
Some processes that are useful here include revisiting your critical path, drafting then SMARTening your objectives, and forcefield analysis for each objective.