Right. That would also affect George H. Bush, therefore the question is wrong, as two presidents were affected. Also, the year 2000 was not a leap year, which is why DIRTPOTUS (sorry, I can't seem to recall the name...) is the answer to the one about two-term presidents. As for #1, "Blaine" rhymes with "Maine". (Ran against cleveland.) As for the others, your guess is as good as mine!)
Any year divisible by 4, except if the year is also divisible by 100 unless the year is also divisible by 400.