“Country first” is just a political phrase to cast one’s own political position as the correct position. (And anyone who disagrees with your position as anti-country.) If I were a politician I would be saying the same thing. (In fact, I’ve said essentially that in other threads. And likewise, that liberalism is a threat to the country.) What would you expect anyone with strong opinions to say?
Sinema will vote 90+% (D). If not 100%. She’s (D) because she believes that (D) is in the best interest of the country.
A majority of AZ voters agree.
“Continue McCain tradition” doesn’t have much meaning either. Toward the end of is political career McCain was voting around 80% ®. A fair translation of the phrase would conclude that Sinema would likewise vote 80% ®, which we all know will never happen.
So it all hinges on the meaning of “Country first”, and without doubt Sinema and McCain differ(ed) strongly on what is best for the country.