In addition to pulling off one of the most coolly executed guest segments in Late Show history last night, President Obama attracted the largest Letterman audience in the span of a full presidential term. With a 14 share, CBS clobbered NBC's Tonight Show with Conan O'Brien by nearly 200% more viewers and out-finished the Jay Leno Show by 27% among households. The last person to garner a larger audience for Letterman was Oprah in 2005. [Hollywood Reporter]