Web media guru Rishad Tobaccowala, chief innovation officer of the media buying division of Publicis Groupe, says much of Barack Obama's success over Hillary Clinton has come down to his superior online strategy. Tobaccowala calls Obama the "digital candidate" versus Clinton, the "analog candidate." Why? "His Web site is amazing," the ad exec claims. "It's completely and continually updated. It feels alive and energetic." Obama has also been able to galvanize the grassroots community through the effective use of email marketing. For example, when Clinton donated $5 million of her own money to her campaign, emails went …