The phrase "to mount a campaign" means to organize and start a planned effort or series of actions to achieve a specific goal, usually related to marketing, advertising, or politics. Full definition
Meanwhile, other activists are mounting a campaign urging disappointed members to Stay In Labour. (mirror.co.uk)
But advocacy groups that have condemned the change in federal policy — which encourages more English and less native - language instruction — are now mounting their campaign against the rules. (edweek.org)
The point of doing a price promotion is to engage your readership and to actually mount a campaign, so you need to be conscious of audience fatigue. (ingramspark.com)