It's a pretty big deal internally, particularly since, as we say here, "the varnish cracked" on some of the right that were pushing for fascistic measures to keep the pro-austerity right on power, but on the greater view of things, we join a bunch of other European countries where the same thing happens, so I don't expect any cross-over over the border. A SYRIZA-style Left Bloc win could have some impact, but for all purposes, the current situation is an anti-austerity third-way party backed by the left, hardly the insane "communist tanks rolling down Lisbon" the right-wing press is making it up to be (yes, really). Plus, regional politics, despite the usual tensions of north vs south, interior vs coast, small cities vs big cities etc don't play much of a hand here.