In his blog, Ricardo Ibarra posted an infographic taken from El Correo that shows the breakdown of the last elections by region within the Basque Autonomous Community, an image shamelessly stolen from him and reposted here (click on the image for a bigger version).
It is interesting to see how things break down. Gipuzkoa went overwhelmingly for the new party, Bildu. Bizkaia is more traditionalist/conservative and went more for EAJ/PNV. Araba is a mix of pretty much everything, though still a majority of EAJ and Bildu.
One thing I find interesting is that Araba is strongly Bildu along its border with both Bizkaia and Gipuzkoa, which maybe makes some sense — those regions would have maybe the strongest Basque identity. But, that didn’t happen so much in Bizkaia. While there are pockets of Bildu strength, it isn’t reflected in the border with Gipuzkoa, for example. Not saying it means anything, I just find it an interesting observation.