The fuck are you talking about? First of all, primaries exist. Secondly, with only a few notable exceptions, Democrats favor single-payer. The original ACA was a government healthcare bill with a private option but Joe Lieberman was the holdout and gutted it. Stating otherwise is intellectually dishonest and deliberately ignorant, or at worst a malicious rewrite of history.

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They’re doing it because the guy on the run crossed state lines. That makes it federal, so the FBI has jurisdiction and it’s easier for them to work cross-border than the NYPD. It’s getting more resources because it’s a highly publicized case. I’m sure there’s some pressure from some wealthy and/or powerful people as well to find whoever did it, but it’s not surprising that the FBI is involved now.