Which has happened x2 in the last 12 months or so (6 days notwithstanding).
But I agree.
This is why I waffle about term limits.
On the one hand they're un-democratic because it's telling people they're not allowed to continue to vote for someone when they're doing a good job. We can imagine an alternate reality where Obama got a 3rd term and Trump never becomes President because Hillary doesn't ever run (I don't think Bush Jr had a snowball's chance in hell of getting a 3rd term if that were an option btw, nor Slick Willy for that matter). Regardless of your side of the aisle, I think Obama will ultimately go down in history at or above the 'average' bar in US Presidents.
On the other, not all (R) and (D) people are created equal, and the way our political system is set up there is almost no chance that an intra-party race occurs to challenge an incumbent. For the President this isn't that big of a deal, but Congress is a different story... because Congressional districts, by design, are supposed to be carved where there is a supermajority, there's almost no chance a shitty (R) or (D) gets unseated in most districts. Similarly, there are a lot of 'red' and 'blue' states where a sitting Senator has a lot of job security until they want to retire. And that's why complete idiots like Nancy Pelosi are still relevant. The average length of a representative that goes up for re-election every two years is 9.7 years...or almost 5 terms. The average length of a Senator is about 11 years, but there are quite a few who exceed that by a very large margin including 13 people who have been in Congress for more than 30 years and a list of over 30 representatives that have been house members longer than 20. Looking at the list, I'd bet that many of them have values and policies that aren't in line with the majority of their constituencies just based on cultural changes over time, but they have the right letter next to their names so they aren't going anywhere.
I would like to see a limit of 8 years in the House, and 12 years in the Senate, with a total of 12 years of total Congressional time. In other words, once you run for a 4th term in the House you're no longer eligible to be a Senator.