Not to read too much into Guam, but it’s been Dem since 1994.
I think Guam is important because it has been under Democratic control for almost three decades—and flipped today.
I don’t think it is a fluke—we may well see more of this kind of thing in congressional districts in various parts of the country.
Let’s look at the numbers in the same race:
2020—Republican only got 21% of the vote against two democrats, finished third (last)
2018—Republican lost by 10%
2016—Republican lost by 8%
2014—Republican lost by 16%
2012—Republican lost by 21%
Summary—the Democrats owned Guam for the last five elections. It flipped to Republican today. It should have been an easy Democratic win.