Why does Obama need a teleprompter while Ted Cruz can speak for hours without one?

AFTER SENATOR TED CRUZ SPOKE FOR HOURS WITHOUT THE TELEPROMPTER CRUTCH THAT THE PRESIDENT MOST ALWAYS USES, EVEN WHEN SPEAKING TO KINDERGARDEN STUDENTS MANY ARE ASKING WHY OBAMA NEEDS ONE AND CRUZ DOESN'T.  WHEN YOU STOP TO THINK ABOUT IT, THE ANSWER IS SIMPLE AND SHOULD BE QUITE OBVIOUS.  WHEN YOU TELL THE TRUTH YOU DON'T NEED A SCRIPT, BUT WHEN YOU LIE IN ORDER TO KEEP YOU STORY STRAIGHT YOU BETTER DAMN WELL HAVE IT RIGHT.  THANKS TO POLITIFAKE  FOR THIS IMAGE.