Yes, unanimously endorsed because Bush appointed him for quid pro quo reasons, and Republicans don’t generally block judges for political reasons and look to see if a judge is truly disqualified and respects the President’s role in choosing judges.
A better litmus test of a judge’s politics is to observe the voting of Democrats. They all loved this guy. If he had wanted to uphold the Constitution, however, believe me, every Democrat would have opposed him vehemently.
Jackson? More of a free-trader. He was known as a populist, but he wasn’t really, he held certain offices before becoming president. Trump is much more an outsider.