Emmanuel Macron scores endorsement from Socialist ex-PM Valls

French former Prime Minister Manuel Valls said on Wednesday he would vote for Emmanuel Macron in the coming presidential election, the biggest Socialist party name to date to turn his back on its official candidate and back the centrist instead.

Valls, a Socialist himself, said the election was wide-open and he would do all he could to ensure that far-right leader Marine Le Pen, second-placed in opinion polls did not win power.

"I'm not going to take any risks," Valls told BFM TV. French opinion polls have consistently shown Macron winning the election in a second-round vote where he would face off against Le Pen.

Valls announced his own candidacy in early December but his campaign fizzled, with Benot Hamon winning the Socialist Party nomination.

French opinion polls show Macron winning the election in a second-round vote where he would face off against Le Pen with Hamon set for a humiliating fifth place in the first-ound eliminator.

On Wednesday, Hamon shot back. "I'm not surprised," he told France 2 television. "This sort of soap opera is meant to weaken me. I'm running my campaign by talking about the French's daily life, not Valls' life."

Not seeking to join camp

The pro-business Valls has been scathing about his former education minister. Hamon signed a motion of no-confidence against Valls' government last year, when the ruling Socialists split over a controversial labour reform led by Valls.

Valls said his choice did not mean he would campaign behind the 39 year-old Macron a fellow minister in President Franois Hollande's government from 2014, but who quit last year to prepare a presidential bid under his own political banner En Marche! (Onwards!).

"I have nothing to negotiate and am not asking for anything, I'm not joining his camp," Valls said.

Valls' endorsement is a mixed blessing for Macron, who has sought to avoid being cast as the candidate of the unpopular outgoing Socialist administration, instead pitching himself as willing to bridge the traditional left-right political divide.

"I'm suspicious of the hidden agenda of politicians," Macron told a news conference on Tuesday amid growing talk that Valls was about to make his intentions known.

Valls is seen as waiting in the wings to pick up the pieces of the Socialist party after the presidential race and build a reformist force in parliament to get a say in a Macron parliamentary majority.