v. Simple past tense and past participle of campaign.
The Century Dictionary and Cyclopedia
That has been sent on or has taken part in military campaigns: as, “an old soldier … campaigned … to death in the service,”
Word Usage
"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 ."