CARACAS (Reuters) - President Nicolas Maduro scoffed at international criticism of Venezuela’s upcoming May 20 vote in which he is seeking re-election and offered a prize for those who vote with a state-issued card.

Supporters of Venezuela's President Nicolas Maduro holding a cardboard cut-out and a painting depicting Venezuela's late President Hugo Chavez attend a campaign rally in La Guaira, Venezuela May 2, 2018. REUTERS/Carlos Garcia Rawlins

Venezuela’s mainstream opposition is boycotting the election on the grounds it is rigged in favor of the 55-year-old socialist incumbent. The United States, European Union and various Latin American neighbors have also slammed it as unfair.

“So they’re not going to recognize Maduro around the world. What the hell do I care?” Maduro said at an election rally in La Guaira, on the coast outside Caracas, late on Wednesday. “What the hell do I care what Europe and Washington say?”

Maduro, who is casting his campaign as a battle against imperialist powers bent on seizing Venezuela’s oil wealth, has only one serious rival: Henri Falcon, 56, a former state governor. Falcon has broken with the opposition coalition’s boycott of the vote, believing anger over an economic crisis will win him votes.

OPEC member Venezuela is in a fifth year of punishing recession, inflation is the highest in the world, oil production is at a three-decade low, shortages of food and medicines are widespread and millions are skipping meals.

Some polls show Falcon more popular than Maduro, who narrowly won election to replace Hugo Chavez in 2013.

But the opposition abstention campaign, the presence of Maduro loyalists in key institutions - including the election board - and vote-winning power of state welfare programs like housing and food giveaways makes a Falcon victory look a tall order.

In his speech, Maduro told supporters that all those who vote showing a government-issued “Fatherland Card,” which is needed to access certain welfare programs, probably would receive “a really good prize.”

He did not give details but critics say that, and other pre-election cash and other bonuses via the card, is akin to vote bribery. Voting in Venezuela is secret but state workers say they are constantly pressured to support the government.

FALCON SEEKS ALLIES

Falcon, a former soldier, has been largely shunned by Venezuela’s best-known opposition leaders but this week received the support of at least one high-profile leader, Enrique Marquez, who is vice president of A New Time party.

He also has been wooing twice-presidential candidate Henrique Capriles to join his campaign but without success so far. Capriles, and another popular opposition leader, Leopoldo Lopez, are both barred from standing in the election.

Maduro says Venezuela’s election system is the cleanest in the world. But even the official operator of the voting platform, UK-based Smartmatic, denounced fraud in an election last August. Little is known about the Argentine company that has replaced it for this month’s election.

If Maduro does win re-election, attention will turn immediately to whether he plans to use the political breathing space to deepen an internal purge of rivals, and if the United States will carry out a threat to impose oil sanctions.

President Donald Trump’s administration already has imposed some financial and individual sanctions on Maduro’s government, accusing senior officials of rights abuses and corruption.

Pro-boycott opposition activists have been stepping up their campaign in recent days with scattered protests around the country. Numbers, however, have been thin - a far cry from the mass anti-Maduro protests of 2017.

The mainstream opposition Democratic Unity coalition said Falcon and others participating in the May 20 vote were simply helping Maduro legitimize a farcical process.

“We urge all citizens ... to not participate in this fraudulent election and to leave the streets empty in expression of our repudiation of the Maduro regime,” it said in a statement.