The New Hampshire Food Bank is starting a new campaign to bring awareness about the more than 140,000 residents in the state who have problems putting food on their tables. It is called the ‘‘Nothing’’ campaign. Cans of ‘‘Nothing’’ will be sold at retailers across the state for $5 and can then be filled and returned with donations. The Food Bank said the cans are sold empty to represent the reality that thousands of the state’s residents experience daily. Governor Maggie Hassan was planning to help kick off the campaign Tuesday at the Harvest Market in Bedford.