NEW DELHI (Reuters) - Rahul Gandhi, the scion of India’s most fabled political dynasty, will within weeks be crowned leader of the Congress party, handing him a freer rein to prove if he can mount a credible challenge to the dominance of Prime Minister Narendra Modi.

FILE PHOTO: India's Congress party vice president Rahul Gandhi gestures during an address at a farmers' rally at Ramlila ground in New Delhi April 19, 2015. REUTERS/Anindito Mukherjee/File Photo

The great-grandson of India’s founding prime minister, Jawaharlal Nehru, has struggled to convince voters - and many in his party - that he is leadership material, especially after a drubbing in the 2014 general election.

Modi’s depiction of the 47-year-old as an undeserving “prince” has helped sideline Gandhi since the last national vote, during which time Congress has suffered some of its worst ever local election results.

But this year the economy has stumbled, and Congress politicians hope a round of state elections, beginning in Modi’s home state of Gujarat, offer them - and their leader - a shot at revival ahead of the next national poll in 2019.

Gandhi will soon take over as Congress president from his 70-year-old mother, Sonia Gandhi, a symbolic promotion that three Congress officials said they hoped would free his hand to shift the narrative from a clash of personalities - which Modi has so far resoundingly won - to a debate about policies.

“You will see many changes and every change will be a reaffirmation of what Congress’s core beliefs are,” said party MP and senior leader Jyotiraditya Scindia, who works closely with Rahul Gandhi.

“The right time has come to strike a chord with the masses against Modi’s governance style, and we will not miss it.”

FOCUS ON JOBS

Congress insiders acknowledge their leader has sometimes made it easy for Modi’s Bharatiya Janata Party (BJP) to question his commitment to politics.

“The key problem with Rahul Gandhi has been his lack of consistency,” said a senior party figure, who declined to be identified. “He frequently takes a break after few roadshows and it is this inconsistency that has been a huge issue.”

But Congress officials say Gandhi has recently been finding his stride criticizing Modi for failing to create jobs, while the party has won a handful of recent by-elections.

Gandhi is traversing Gujarat, the western state where Modi made his name, to fire up his party workers.

He has ditched some of the party rallies for one-on-one meetings with trade unions, dairy workers and small traders - a traditional Modi powerbase that has been hit hard by recent economic reforms championed by the prime minister.

Modi has taken notice.

Last week he told workers from his Hindu nationalist BJP that the Nehru-Gandhi dynasty would “destroy Gujarat”.

His party president, recently dispatched to the Gandhi family heartland in northern India, said this month that Gandhi needed to swap his “Italian” glasses for “Gujarati” spectacles to see the economic development the BJP had brought to the region, in a jibe at his Italian-born mother’s roots.

“BJP would love it to be a war of personalities. Congress has to frame it as a war of two different approaches, even ideologies,” said Sandeep Shastri, a political scientist and Congress expert at Jain University.

Gandhi, who rarely talks to the media, declined a Reuters interview request.

UNLIKELY TO WIN

Rahul’s father, grandmother and great-grandfather were all prime ministers in post-independence India. But critics deride Gandhi as a political lightweight who depends on his family name for power.

Bursts of political energy have been followed by lengthy absences. In 2015 he took nearly two months of leave, prompting Modi’s party to accuse him of “holidaying” while parliament was in session.

Congress now governs states home to less than 10 percent of India’s 1.3 billion population, its powerbase shriveled under the onslaught of Modi’s popularity.

Congress insiders acknowledge the party is unlikely to win the December election in Gujarat, but cutting into the BJP majority in the state would send a powerful signal that Congress under Gandhi has a fighting chance against a still-popular Modi.

Gandhi has set up a new social media team in New Delhi to work on his image, and officials say he has been forging better ties with regional parties that are often key powerbrokers in India politics.

On a recent tour of Gujarat, Gandhi reached out to the frustrations of the state’s powerful business community with a new tax regime, including small traders such as those selling dry fruits.

Different tax rates on almonds and cashews, imposed under a new national sales tax Modi’s government launched in July, had left traders confused and damaged sales during the peak festival season.

“We have to show him as the face of the party before Gujarat elections,” said a close aide, who declined to be named.

BJP leaders say they are untroubled, and that any small bounce in Gandhi’s standing will die down once the economy strengthens. Modi has called the slowdown a blip.

“What does his claim to fame rest on?,” said Nalin Kohli, a national spokesman for the BJP. “Two months of campaigning does not make him an active politician.”