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<?xml version="1.0"?>
<config>
    <global>
        <events>
            <tnw_salesforce_campaign_member_send_before>
                <observers>
                    <tnw<salesforce_salesforce_campaign_member_send_before>before_observer>
                        <class>tnw_salesforce/observer</class>
                        <method>campaignMemberSendBefore</method>
                    </tnw_salesforce_campaign_member_send_before>before_observer>
                </observers>
            </tnw_salesforce_campaign_member_send_before>
        </events>
    </global>
</config>

<?php

/**
 * Class TNW_Salesforce_Model_Observer
 */
class TNW_Salesforce_Model_Observer
{
 
    public function campaignMemberSendBefore(Varien_Event_Observer $observer) {
		/** 
		 * Array of Salesforce objects
		 * @var arraystdClass[] $_data
		 *
		 * Example:
		 * array (size=1)
		 *   0 => 
		 *     object(stdClass)[834]
		 *       public 'ContactId' => string '0032400000MF2tAAAT' (length=18)
		 *       public 'CampaignId' => string '70124000000MjVG' (length=15)
		 */
		$_data = $observer->getData('data');

		// Your custom code
    }
 
}