Ben Blair and Nick Robinson kicked six points each for the Blues.
Felipe Contepomi equalled Blair and Nicky Robinson's tally with the boot.
From the restart, Blair sidestepped through and Jamie Robinson gave Gareth Thomas the scoring pass for the full-back to convert and give the Blues a 27-17 half-time lead.
Mr Robinson, a rich Blair backer, lent the prime ministerial favourite, Mr Mandelson, a large sum to buy a large and expensive London house.
First Blair calmly stroked over his second penalty, before Robinson clipped over a snap drop-goal to reduce the deficit to 9-10.
Blair scored his first after a slashing break from Robinson had been carried on by mobile loose-head prop Gethin Jenkins, and replacement Sweeney then latched onto a loose ball straight after coming onto the field for the second.
Its existence came to public notice just when, after a quarter-century of intermittent activity on the Labour back benches, Mr Robinson had become a Treasury minister in Tony Blair's new government, and not long after he, of all ministers, had been put in charge of a government effort to winkle out offshore tax havens.
Mr Blair says he knew nothing of the transaction, though Mr Robinson may have another story to tell when the book comes out on November 2nd.
The Blues were 10-0 up after just 12 minutes thanks to Jamie Robinson's try and a conversion and penalty from Blair.
If Kellock and Cusiter miss out, head coach Andy Robinson will need to select a new skipper, with Mike Blair among the likely contenders.
Rory Lawson and co-captain Mike Blair both played a part in Saturday's win in Tucuman and offer Robinson cover.
When the ball came back, Jamie Robinson snapped up brother Nicky's bouncing pass to give Ben Blair the time and space to set up Halfpenny's chance.
Robinson took the decision to demote Ally Hogg to vice-captain after Blair's impressive leadership on Scotland duty.
Fly-half Nicky Robinson's clearance was charged down and when full-back Ben Blair failed to halt the danger, centre Gonzalo Garcia followed up to score and Gerard Fraser converted.
But the spokesman said the suggestion Mr Blair's aides could manipulate the findings or presentation of a forthcoming inquiry into Mr Robinson's business dealings was "all wrong".
BBC: News | UK Politics | Downing Street denies gagging Robinson
The question of who bankrolled Mr Blair's office in opposition resurfaced with the serialisation in the Daily Mail newspaper this week of Mr Robinson's memoirs.
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