Answer: dde

AnswerCrossword Clue
DDE'50s pres.
DDEPres. who appointed Earl Warren
DDERMN was his running mate
DDE'50s monogram
DDEIke's initials
DDEPres. when SEATO was formed
DDEPresidential monogram
DDE"I Like Ike" initials
DDEOperation Overlord monogram
DDEPres. who championed the interstate system
DDEHe followed HST
DDEAES defeater
DDEWWII general who became pres.
DDE'50s political monogram
DDEPres. before JFK
DDE34th pres.
DDELast pres. born in the 19th century
DDEPres. during Brown v. Board of Education
DDE'50s political initials
DDEFive-star gen. of WWII
DDEPres. whose given birth name was David
DDENASA's creator
DDEIke's monogram
DDEPreceded JFK
DDEHST successor
DDEIke
DDEHST follower
DDEHST's follower
DDEJFK's predecessor
DDEJ.F.K.'s predecessor
DDEFive-star general and president's initials
DDEETO commander
DDE1950s monogram
DDERMN's onetime boss
DDE117 Down's successor
DDEH.S.T.'s successor
DDEHST's successor
DDEPOTUS after HST
DDEWhite House monogram
DDEJFK predecessor