Commenter “buzzsawmonkey” posted the following in a discussion on PJMedia. Agree or disagree, the metaphor is rather colorful.
“The Republicans are what Orwell called “a permanent and pensioned opposition.” They are the inflatable doll in the passenger seat that enables the Democrats to drive in the carpool lane.
More properly, they are the Palooka Party. They see their role as taking dives for the Democrats for the guaranteed short money, as a palooka fighter in a 1930s pulp-fiction story would take a dive for [the] kid being groomed by the gambling syndicate for a shot at the title. The Republicans’ job, as palookas, is to make it look good—put up a flurry of opposition before getting showily knocked out in the sixth round.
Mitch McConnell and Paul Ryan don’t want to govern—nor do the other palookas in their party who voted to put them where they are. They want to go back to the safe business of taking dives for the guaranteed short money.”
Terry: It wasn’t him, Charley, it was you. Remember that night in the Garden you came down to my dressing room and you said, “Kid, this ain’t your night. We’re going for the price on Wilson.” You remember that? “This ain’t your night”! My night! I coulda taken Wilson apart! So what happens? He gets the title shot outdoors on the ballpark and what do I get? A one-way ticket to Palooka-ville! You was my brother, Charley, you shoulda looked out for me a little bit. You shoulda taken care of me just a little bit so I wouldn’t have to take them dives for the short-end money.
Charlie: Oh I had some bets down for you. You saw some money.
Terry: You don’t understand. I coulda had class. I coulda been a contender. I coulda been somebody, instead of a bum, which is what I am, let’s face it. […]
The word “palooka” appears to have been coined in the 1920s by Variety sports writer Jack Conway, as a term for “a mediocre prizefighter”. Wikipedia (caveat lector) claims it was derived as a kind-of spoonerism from the ethnic slur “Polack”. However, the talk page for the article suggests a much more plausible etymology: the Italian word pagliuca (a Southern dialect diminutive of paglia=straw or chaff), i.e. “little straw [guy]”. It’s hardly a stretch to assume that Mafiosi engaged in match-rigging would have referred to the designated loser as a pagliuca —which an English speaker unfamiliar with Italian would have transliterated as something like palooka.
A more modern form of “designated loser” would be the Washington Generals against the basketball exhibition team, the Harlem Globetrotters. Indeed, that very metaphor can be found online in a US political context, in both directions.