Answer: leapyears

AnswerCrossword Clue
LEAPYEARS

When US presidents are almost always elected

LEAPYEARS

They contain an extra day

LEAPYEARS

2000 and 2004

LEAPYEARS
Periodic synchronizations
LEAPYEARS
Quadrennial events
LEAPYEARSWhen Presidential elections take place.
LEAPYEARSThirteen since 1900.
LEAPYEARSCalendar phenomena.
LEAPYEARS1940, 1980, etc.
LEAPYEARSWhen U.S. Presidents are elected
LEAPYEARS2004 and 2008