In 2011, the Bears made their visit to the White House, 25 years after their originally intended visit was cancelled due to the Space Shuttle "Challenger" disaster, as former President Barack Obama is a Bears fan. At that time, Obama called them the greatest team ever; however, he called his own words into question when hosting the 1972 Dolphins, the only NFL team with a perfect season. Obama noted that the only loss the 1985 Bears had was to the Dolphins.