Yes, campaign is a Scrabble word!

Verb

1. Run, stand, or compete for an office or a position

2. Exert oneself continuously, vigorously, or obtrusively to gain an end or engage in a crusade for a certain cause or person; be an advocate for

3. Go on a campaign; go off to war

Noun

1. A race between candidates for elective office

2. A series of actions advancing a principle or tending toward a particular end

3. Several related operations aimed at achieving a particular goal (usually within geographical and temporal constraints)

4. An overland journey by hunters (especially in Africa)