"Can you tell me his name?" asked Guadalupe Venegas of Telemundo.
"No," she responded simply.
California billionaire Tom Steyer also failed the global leader gotcha test, but South Bend, Ind., Mayor Pete Buttigieg was able to recall Andrés Manuel López Obrador's last name.
Obrador has also made headlines as the media in Mexico has painted him as the country's version of President Donald Trump. While he has criticized Trump for comments he's made about migrants, Obrador has also cooperated with demands from Trump that he pressure migrants from Central America to stay in Mexico.
Telemundo is an American Spanish language news network owned by Comcast through NBCUniversal.
Klobuchar's campaign got a much-needed lifeline when she came in third place in the New Hampshire primary, just behind Sen. Bernie Sanders (I-Vt.) and Buttigieg.
ABC news campaign reporter Will Steakin noted that Klobuchar had voted in favor of the United States–Mexico-Canada Agreement (USMCA), but could not name the president.