1:06pm: There are increasingly desperate warnings of a humanitarian catastrophe today from Syrian activists and humanitarian groups as the Syrian government resumed shelling an opposition neighborhood in the city of Homs. Hundreds have been killed in the three week-long siege of the city by government forces. U.S., European, and Arab officials are working on an ultimatum today to demand that President Bashar Assad allow humanitarian aid in. The group, calling itself, "Friends of Syria," is formally meeting tomorrow. Secretary of State Hillary Clinton will be there and the advance word is that they will require Syria to comply to their demands within 72 hours. We'll talk about what might happen.1:12pm: Rick Santorum found himself in the hot seat last night, sharing frontrunner status with Mitt Romney. Karl Rove has an op-ed in the Wall Street Journal today saying the GOP's presidential nominee will be picked from the current field of four -- even though there have been grumblings that some republicans want another candidate to swoop in. The Washington Post's Karen Tumulty joins us with the latest from the GOP primaries.1:35pm: At last night’s Kentucky Author Forum, Michio Kaku talked about some of the technologies that will drive our future. He was interviewed by another futurist, Dr. James Canton. We'll hear part of a conversation between Dr. Canton and WFPL's Todd Mundt about whether rising gas prices might result in more fuel efficient cars and more mass transit options.