Factbox: Five things to watch in presidential debate

(Reuters) - The Republican presidential contenders meet on Tuesday in their 11th debate in the race for the nomination to challenge President Barack Obama in 2012. Here are five things to watch during the foreign policy debate at DAR Constitution Hall in Washington, the second debate on the subject in the last 10 days. CAN GINGRICH MAINTAIN HIS MOMENTUM? Former House Speaker Newt Gingrich has ...