Mein is neuter. Meine Kampagne is correct with the correct spelling. All nouns in German are large cap and have gender. Kampagne is a feminine noun.
English is the dominant West Germanic language with only a small hand full of nouns with gender, such as boy and girl. English nouns require no special article such as die, der, das, mein, meine, meinen. The and my serves all English nouns
I abuse 3 languages.