The sentence: from NPR transcript
WOOD: John Derbyshire is - so he was a writer for the National Review. He has made claims such as intelligent, well-socialized African-Americans are as rare as fancy commercial jets - right? - so things like that, very inflammatory, very incendiary. And he was a Trump supporter down the line.
In the bold sentence quoted above, isn't it that "was" indicates past tense (things that happened), so won't that contradict with "down the line" (in the future)?
And shouldn't it be like this:
"And he "might be" a Trump supporter down the line."