“I respect a member of my party crossing the aisle, even on a vote I oppose.”

The clearest recent test case is Pennsylvania Democrat John Fetterman, who has built a pattern — not a single vote — of breaking with his own party: confirming Trump cabinet nominees, siding with Republicans on government funding, and appearing in a surprise video introducing GOP Sen. Dave McCormick at the Republican midterm convention. He insists he's staying a Democrat and still backs his party on most partisan votes, but nearly two-thirds of Pennsylvania Democrats now view him unfavorably. His case forces the real question: does respecting someone's independent streak hold up once the pattern becomes long and their own side turns against them?

John Fetterman (Democratic senator, defends the pattern as principle, not disloyalty): "I don't have a reason to [join the Republicans]," pointing out he still votes with Democrats on most partisan bills. On purity tests pushing out independent-minded members: "If we want a big tent party... [that] means I happen to believe it is appropriate to hold Iran accountable and to stand with Israel" without being forced out for it. Pennsylvania Democratic voters and party figures (against the pattern, per NPR reporting): growing dismay back home, with Fetterman's own base souring on him over his repeated breaks with the party, to the point that most Pennsylvania Democrats now disapprove of the job he's doing. David Marcus (conservative columnist, right-leaning perspective praising the pattern): argues it's not that Fetterman left his party but that "his party moved away from Fetterman," crediting him with speaking "plain sense regardless of party talking points, marching orders or the flickering winds of public opinion."