1. worked in an organized way to achieve a particular goal, especially in politics
Usage: past tense of campaign
2. took part in a series of military operations in a particular area
Usage: military context; past tense of campaign

Examples

• She campaigned tirelessly for environmental protection.
• The candidate campaigned in three states last week.
• They campaigned against the new tax proposal.
• The general campaigned in Europe during World War II.
• Local residents campaigned to save the historic building.
• He campaigned for mayor but lost the election.
• The organization campaigned for better working conditions.