I really liked the story about Michael Bloomberg's finances the NYT did just recently.
https://www.nytimes.com/interactive/2020/02/15/us/politics/michael-bloomberg-spending.html
They reported how Bloomberg upped his political and charitable donations in the last years and can now count on allies all across the countries. The data and visualisation they show underscores their reporting as it lets the user move through different years and see how more and more donations pop up all across the country (including the amounts, which keep growing).
They also used data to show what issues Bloomberg has spent the most on and to compare spending to the behavior of other candidates.
Not only is the data extremely helpful to get a deeper understanding of the story, it also adds value because of its visuals and the interactive way it is presented.