1:06pm: Mitt Romney emerged with the most delegates after yesterday's Super Tuesday races in 10 states. Eric Cantor, House majority leader, says Romney has a clear path of Tampa, where Republicans will gather for their nominating convention this summer. Rick Santorum's supporters tried to elbow Newt Gingrich out of the race in a bid to unite conservatives behind Santorum. Gingrich says he's pressing on, as is Ron Paul. We'll talk about what's next for the GOP candidates.1:12pm: Amazon is moving into the book publishing industry. The online behemoth has hired former Time Warner Publishing CEO Larry Kirshbaum to head its new venture, and Bloomberg Businessweek reporter Brad Stone says the publishing industry is running scared. "I think they're terrified," Stone says. "Amazon is their biggest customer... and they've been at Amazon's mercy for quite some time." Stone's cover story on Amazon recounts the bad blood between Amazon and the big six publishers that goes back to the launch of the Kindle. He says this is part of a trend in the business world where companies are creating entire ecosystems to sell their products, spurred by Apple's dominance of tablets and phones.1:40pm: The defection of more than 30 advertisers from Rush Limbaugh's talk radio program isn't stopping the conservative firebrand, who's been under a hail of criticism for comments he made about Georgetown University law student Sandra Fluke after she testified in favor of President Obama's birth control policy. All of this has touched off the latest debate over how much power Limbaugh has in the GOP. We'll talk about it. Is he, as President Obama's former chief of staff Rahm Emanuel once famously said, "Rush Limbaugh is the voice and intellectual force of the Republican Party," or not? A piece in Politico today asks "Who's Afraid of Rush?" and concludes that fewer Republicans are, because of the Fluke flap.