Odds of being elected to a 2nd term

Barack Obama was only the 17th President elected to a 2nd term and only the 14th to serve at least two complete terms (Lincoln and McKinley were assassinated and Nixon resigned during their second terms). So, while our last 3 Presidents (Obama, Bush, and Clinton) and 4 of the last 5 (add Reagan) were elected to and served a second term, that is not the historical norm but rather a more recent trend. While it is way too early to begin handicapping the odds of President Trump's potential second term, history shows that it is far from a sure thing.