Query: How many CPSU endorsement having candidates lost to independents?
Context: In district races, run-off elections were held in 76 constituencies on April 2 and 9 and fresh elections were organized on April 20 and 14 to May 23, in the 199 remaining constituencies where the required absolute majority was not attained. While most CPSU-endorsed candidates were elected, more than 300 lost to independent candidates such as Yeltsin, physicist Andrei Sakharov and lawyer Anatoly Sobchak.