KEY POINTS
  • Emmanuel Macron's victory in the French presidential election's first round of voting does not mean that his potential leadership will be plain sailing, one Goldman Sachs economist told CNBC
  • The Macron/Le Pen runoff symbolizes a broader shift in European politics away from a traditional left/right definition
  • Le Pen's nationalist, Eurosceptic stance could form a credible long term mainstream opposition to governing parties in France

With centrist French presidential candidate Emmanuel Macron topping the polls in Sunday's first round of voting, many are heralding the political upstart's ability to overturn mainstream politics. But one Goldman Sachs economist sought to calm the fever surrounding Macron, also placing him within a broader European political movement.

Macron's leading 23.9 percent of the vote represents "quite a fundamental realignment of politics in France, and maybe more broadly in Europe," Huw Pill, chief European economist at Goldman Sachs, told CNBC's Squawk Box Monday. But, he detailed that "perhaps we should interpret this as a very important step, but still only a step."