Rival campaigns in Greece's bailout referendum end Friday, with rallies planned in Athens for "Yes" and "No" supporters — at the same time.
The events will happen 800 meters (875 yards) apart in central Athens, to accommodate a five-day campaign on one of the most important votes in Greece's modern history that still has many voters confused about about what's at stake.
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Costas Christoforidis, a 37-year-old farmer, hasn't decided how to vote Sunday.
"If it's saying 'No' to austerity, then it's a 'No' from me too. But if we are rejecting Europe, I disagree with that," he said.
As Greek banks and markets remain closed Friday for a fifth day, rival campaigns scrambled to roll out their messages. And a prediction from the International Monetary Fund that Greece will need piles of additional cash from eurozone countries and others over the next three years put even more pressure on the government.
"Our efforts are focused on overcoming the crisis as fast as possible — with a solution that preserves the dignity and sovereignty of our people," Prime Minister Alexis Tsipras said.
The popular 40-year-old prime minister is gambling his government on a call to voters to reject austerity measures demanded by bailout lenders, despite coming close to a deal last week.
A strong "No" vote, he argued, would help Greece win a new deal with the eurozone's rescue mechanism that would include terms to make the country's 320 billion euro national debt sustainable.
After the vote, he insisted, a deal could be struck "within 48 hours."
Opponents don't believe him and say he is risking the country's future — asking voters to weigh in on a bailout offer that expired at midnight on Tuesday.
"They are making a serious mistake. Because the world will consider a 'No' vote to be a withdrawal from the heart of Europe — the first step toward euro exit," former conservative prime minister Costas Karamanlis said, making his first public speech in six years to endorse the "Yes" campaign.
Tsipras' argument was also dismissed by the head of the eurozone finance ministers' group, Dutch Finance Minister Jeroen Dijsselbloem.
"That suggestion is simply wrong," Dijsselbloem told lawmakers in the Netherlands.
European officials and the Greek opposition have warned a "No" outcome Sunday could be tantamount to a decision to leave the euro.
"The consequences are not the same if it's a 'Yes' or 'No,'" French President Francois Hollande said.
"If it's the 'Yes,' even if it's on the basis of proposals that have already expired, negotiations can resume and I imagine be quickly concluded," he said. "We are in something of an unknown. It's up to the Greeks to respond."
And in one of the clearest signs yet that the future of the government is on the line in Sunday's vote, the country's outspoken finance minister, Yanis Varoufakis, told Australia's ABC radio he was likely to resign if a "Yes" vote prevails.
Tsipras signaled the same earlier this week, declaring on state TV that he was not an "all-weather" prime minister — a strong indication he would step down if his proposal is defeated.
Tension surrounding the vote has remained high since banks closed this week and were forced to impose strict cash withdrawal limits.
Elderly Greeks, some struggling with walking sticks or being held up by others, have been forming large crowds outside the few banks opened to help pensioners without ATM cards get access to money.
Elsewhere in Athens, campaigners battled for visibility as time to reach voters was running out. "Yes" posters appeared for the first time around the city, while TV ads only began airing a day earlier. The two main rival rallies are scheduled in central Athens at 7:30 p.m. (1630GMT).
Some 6,000 supporters of the Greek Communist Party late Thursday attended a rally outside parliament. The party urged voters to cast invalid ballots in protest of Greece's continued membership in the European Union.
The country has been thrown into financial limbo after missing a massive IMF repayment this week when its bailout program expired.
Raising the stakes further for Sunday's vote, an IMF report released Thursday but compiled last week before the talks collapsed, warned that to avoid financial collapse, Greece would need additional debt relief costing 50 billion euros ($56 billion) and lasting through 2018 — a bleak prospect for a country that has already endured six years of recession.
Ashkoda Mody, a visiting professor in international economic policy at Princeton University, argued the IMF's call for debt relief should have been made far earlier, before the talks collapsed.
"If the IMF and other creditors had this document while they were negotiating with the Greeks, it is completely unconscionable that they did not discuss deep debt relief," he said.
Polling data on Sunday's vote has been scarce during the weeklong campaign, with one research company saying Thursday that a survey showing a narrow lead for the "Yes" vote was based on an unauthorized leak of partial data it had gathered.
One source of confusion is the actual question being posed to voters — 17 lines of bureaucratic language that ends with the "No" option placed above the "Yes."
Mulling her response, 64-year-old retiree Eleni Maili said: "I can't vote 'Yes' or 'No' — both have their pitfalls. And in the end, the lenders will just interpret the result in a way that suits them."
She did have one question of her own, though.
"I do wonder about all that money we got over all those years," she said. "Where is that money? Because the people didn't see any of it."
Online: Official referendum website http://www.referendum2015gov.gr/en/
Associated Press reporters Elena Becatoros and Paris Ayiomamitis in Athens, Paul Wiseman in Washington, Michael Corder in The Hague, Netherlands, Angela Charlton and Lori Hinnant in Paris contributed to this report.
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