I think you really need to know whether the Presidential Historians/Political Scientist are registered Republicans, Democrats, or Independent/Other. Political bias and partisanship will have the greatest impact on the most recent Presidents. So siting a President ranking high from decades ago is not really a way to determine if the list was skewed because of partisanship.
You should probably have 3 different list:
A. One done by 100 registered Republican Presidential Historians/Political Scientist
B. One done by 100 registered Democratic Presidential Historians/Political Scientist
C. One done by 100 registered Independents/other smaller political parties Presidential Historians/Political Scientist
You then average the results of each of the three list into one list. While not perfect, you get a list that is far more free of political bias and partisanship than the ones shown on Wikipedia.
I think if you could see the party registration status of those contributing to the list on Wikipedia, you find that most would have strong majorities of registered Democrats.
That was done. Granted it doesn't include newer presidents since it was done in the 80s.
But what it shows is over time as the initial political division fades we see the stances become very similar.
In the end harding Grant Johnson and Pierce and Buchanan are the 5 which both sides had agreed. And the top 8 were a consensus of both sides, with Lincoln a consensus number one and Washington/FDR number two and three
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I think while that shows that statements and beliefs of a president soon after office remain strongly divisive, over time you can judge the impact of those. So while Lincoln was arguably the least liked president at the time, his positive impact is what he is measured on. Whereas soon after Jimmy Carter's presidency, his dislike was high, but decades later his impact for good/bad of the US was minimal in comparison to others. LBJ/Eisenhower were the only top 10 and difference between groups, which were also the only two presidents to make up the most recent ones in that top 10.
LBJ is a good case
I hated him when he was President. He was hounded out of office
But he did remarkable work on Civil Rights and anti poverty programs.
But then there was Vietnam, how stupid was that?
I look at LBJ filling JFKs second term. Given the political climate of the time, I think JFK would have made the exact same decisions. So would Nixon and Goldwater. I doubt there were any politicians of that era who would have turned their back on a Communist takeover of Vietnam
I agree. The Domino theory (let one country fall to communism and their neighbors are the next target) was commonly supported at the time, and I would say with good reason (see Eastern Europe).
While in hindsight, much like how many view Operation Iraqi Freedom, it was not a popular war, at the time (much like OIF), it was supported by most.
The invasion of Afghanistan had popular support
Iraq had tepid support. Most Democrats opposed it
Those who did support the invasion of Iraq feared being labeled soft on terrorism much like being labeled soft on communism a generation before
The invasion of Iraq had heavy support from both Republicans and Democrats. The majority of Democrats in the Senate supported the invasion. Overall public support for the invasion of Iraq prior to the start of the war was higher than support for the 1991 Gulf War before hostilities began.
In 1991, public support and support in Congress was much more divided about going to war at the time. In the aftermath, future presidential hopefuls like Senator Sam Nunn payed a price for not voting to support the first Gulf War.
Today, support for Operation Iraqi Freedom is split with those still supporting in the low 40s, and those against it in the high 40s. You get reverse results when you ask the veterans who fought in Iraq, with a very slight plurality or majority supporting it.
But that was the same with World War I and Korea. After those conflicts were completed a slight majority were against them for many years. But over time, the evolved into a majority saying involvement in those conflicts was a good thing.
Iraq will likely end up the same way. At the end of the day, there was nothing good about Saddam. He was evil and had caused everyone problems for decades. Few people will be willing to defend or stand up for Saddam in the years ahead. Iraq's standard of living is increasing, ahead of Morocco now. The murder rate in Iraq for 2018 was less than the murder rate in California for 1990. Kuwait and Saudi Arabia are much safer with Saddam gone. People become frustrated with the unexpected cost and duration of the conflict at the time, but ultimately in the long run its likely most people will judge that It was worth it.