Partisan politics and assigning responsibility

It seems that, just ahead of Spain's election tomorrow, its government prefers to assign responsibility for thursday's terrorist attack on ETA rather than al-Qaeda. If the latter is in fact responsible, this would call into question Madrid's support for the US-led war in Iraq. If ETA is to blame, the current government would be helped, since it has taken a tough line on the Basque terrorist organization. It is, of course, unlikely that investigators will find the answer before voters go to the polls.