Wow, I never thought of that.
"Compared with 2002, the percentage of full-time U.S. journalists who claim to be Democrats has dropped 8 percentage points in 2013 to about 28 percent, moving this figure closer to the overall population percentage of 30 percent, according to a December 12-15, 2013, ABC News/Washington Post national poll of 1,005 adults. This is the lowest percentage of journalists saying they are Democrats since 1971. An even larger drop was observed among journalists who said they were Republicans in 2013 (7.1 percent) than in 2002 (18 percent), but the 2013 figure is still notably lower than the percentage of U.S. adults who identified with the Republican Party (24 percent according to the poll mentioned above)."
(https://www.washingtonpost.com/news/the-fix/wp/2014/05/06/ju...)
"Some of the professional groups have clear liberal leanings. People who work in the news media are almost exclusively donors to liberal candidates:"
(https://www.businessinsider.com/charts-show-the-political-bi...)
[1] https://en.wikipedia.org/wiki/2008_United_States_presidentia... [2] https://en.wikipedia.org/wiki/2012_United_States_presidentia... [3] https://en.wikipedia.org/wiki/2016_United_States_presidentia... [4] https://en.wikipedia.org/wiki/2020_United_States_presidentia...
Even if you read “voting for a D or R candidate in a Presidential general election” as “being a D or R”, and “eligible voters” as “the American population”, both which are clearly and wildly wrong, your evidence still doesn’t support your claim, because it has 98.2% of 66.2% = 65% of eligible voters, which is not “well above 90%”.
PS Americans also overwhelmingly vote either Democrat or Republican in non-presidential elections, even down to the city council level.
Americans overwhelmingly abstain rather than voting for any of the offered candidates, Democrat, Republican, or independent or minor party, in non-Presidential elections. 2018 had the highest midterm turnout since the before the Reagan era, and it reached the whole way up to 49%.