The swamp supported McCormick, not Oz.
Trump is 100% responsible for Oz
John Fetterman is one man who will never go door-to-door campaigning. Take that to the bank.
The first choice of the swamp is Fetterman - and Kathy Barnette is the one they feared. So, a milquetoast Republican opponent is what they wanted - either Oz or McCormick - it makes no difference to the swamp.