Editor's note: Gloria Borger is CNN's chief political analyst, appearing regularly on shows such as "AC360˚" "The Situation Room," "John King USA" and "State of the Union."
(CNN) - No doubt about it, the Republican presidential candidates are reaching a critical point: It's less than one month before the Iowa caucuses. A majority of GOP voters - and Iowa caucus-goers - say they could still change their minds. The president has thrown down the gauntlet on tax cuts for the middle class, and the GOP needs to speak with one voice in response. It's decision time, and there are real questions that need to be answered with clarity.FULL STORY