PARIS — French voters don’t choose their next president until April, but terrorism, immigration and incumbent President Francois Hollande’s dismal approval ratings are already fueling an anti-establishmentarian wave that is once again helping the far-right, anti-immigrant National Front.Opinion polls show that National Front party leader Marine Le Pen would win 30 percent of the national vote if elections were held today. That would be a big gain from her tally of 18 percent in the 2012 election, which put Socialist Party standard-bearer Mr. Hollande in the Elysee Palace for the first time.
