$data['gov_data_bill']['sponsor'] = array(
    'title' => t('Sponsor'),
    'help' => t('The ID of the sponsor to this bill.'),
    'field' => array(
      'handler' => 'views_handler_field_numeric',
      'click sortable' => TRUE,
    ),
    'filter' => array(
      'handler' => 'views_handler_filter_numeric',
    ),
    'sort' => array(
      'handler' => 'views_handler_sort',
    ),
    'relationship' => array(
      'base' => 'gov_data_person',
      'base field' => 'id',
      'handler' => 'views_handler_relationship',
      'label' => t('Cosponsor'),
    ),
  );