France's Undecided May Determine Presidential First Round: Chart

(Bloomberg) -- The battle to reach the runoff in France’s presidential election is putting pollsters to the test as never before. With just a few days to go before Sunday’s first round of voting, the four potential finalists are within a range of fewer than 4 percentage points. On top of that, as many as 40 percent of voters have yet to decide on their candidate, according to estimates by multiple polling firms.