Simple past tense and past participle of campaign.(verb)
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Use "campaigned" in a sentence
"Crazy Shelly has a host of pet preachers who have campaigned from the pulpit on her behalf."
"A page right out of what McCain campaigned on … Change …. you can believe in!"
"Last time Iain campaigned in the area I live in he managed to increased the number of Lib Dem vote by several thousand so I am hopeful he will be able to repeat again ."