How a ponytailed populist launched a party that could shake up the eurozone

As Greece's new Syriza government negotiates the terms of its debt repayment, Spain is pushing Greece to drop its anti-austerity ambitions and accept Europe's terms.

Spain's keen interest in Greece likely stems from the rise of Podemos, a wildly popular left-wing Greek party that's closely aligned with Syriza, as Bloomberg Businessweek noted this weekend.