political campaign — as used in the U.S., it's synonymous with electoral campaign (the competitive efforts by candidates and political parties to win voter support in the period preceding an election), but can also be used to talk about a larger effort put together by an issue advocacy group
inside versus outside lobbying, AKA direct lobbying versus indirect lobbying (AKA grassroots lobbying) — directly contacting legislators, versus attempts to mobilize citizens outside the policy-making community