Sarah Palin won her second TV battle with Katie Couric.Palin's controversial guest-hosting stint on "Today" helped propel the show to a ratings victory on Tuesday. That's not news in and of itself -- after all, "Today" has won nearly every day for 16 years -- but Couric's week-long return to morning television on "Good Morning America" has added a new intensity to the proceedings."Today" drew 5.497 million viewers, with 2.209 million of them in the coveted A25-54 demo.