How many, if any, general election presidential races that were
considered hotly contested and or "too close to call" were decided by
a margin than greater than 5% of the popular vote cast? Who were the
candidates, what parties what years were they and what were the
popular vote counts?
Since 1900, how many US Senate races that were considered hotly
contested and or "too close to call" were decided by a margin than
greater than 5% of the popular vote cast? Who were the major party
candidates, what states were the races, what year and what were the
vote totals.

Great question. 1angst!

I'm posting this comment to remind me to look up the answer.

Hope you don't mind ... You can do the same on any of my questions should you wish.

All the best

Bryan