public function __construct($campaignId = null, $adGroupId = null, $criterion = null, $bidModifier = null, $baseAdGroupId = null, $bidModifierSource = null)
{
$this->campaignId = $campaignId;
$this->adGroupId = $adGroupId;
$this->criterion = $criterion;
$this->bidModifier = $bidModifier;
$this->baseAdGroupId = $baseAdGroupId;
$this->bidModifierSource = $bidModifierSource;
}