Se isto não é politica...

No mesmo dia em que foi tomada semelhante decisão pela mesma agência de rating em relação a todos os países da zona euro:

LONDON (Standard & Poor's) Dec. 5, 2011--Standard & Poor's Ratings Services
today placed its 'BBB-/A-3' long- and short-term sovereign credit ratings on
the Republic of Portugal on CreditWatch with negative implications.

RATIONALE
The CreditWatch placement is prompted by our concerns about the potential
impact on Portugal of what we view as deepening political, financial, and
monetary problems within the eurozone. To the extent that these eurozone-wide
issues permanently constrain the availability of credit to the economy,
Portugal's economic growth outlook--and therefore the prospects for a
sustained reduction of its public debt ratio--could be affected. Further, it
is our opinion that the lack of progress the European policymakers have made
so far in controlling the spread of the financial crisis may reflect
structural weaknesses in the decision-making process within the eurozone and
European Union. This, in turn, informs our view about the ability of European
policymakers to take the proactive and resolute measures needed in times of
financial stress. We are therefore reassessing the eurozone's record of
debt-crisis management and its implications for our view on the effectiveness
of policymaking in Portugal.