The polls just closed less than 30 minutes ago in Costa Rica - the international observers from the Organization of American States has said that things have been mostly calm when they were interviewed at around 2 PM EST, although some observers were not accredited by the electoral authorities and were turned away - not clear what the story is there. The "no" campaign is denouncing irregularities in the process, including the absence of officials from the "no" campaign that are supposed to be watchdogging every precinct, and incomplete photo IDs of voters in the registries.
Apparently 3,000 people got voter identification cards today, 700 of which were just requested today. (The last one apparently distributed less than an hour ago.) The OAS will publish a report on any discrepancies in the election over the next few weeks, and asked Costa Ricans to respect the outcome of the vote.
The results from 20-40% of the precincts will be in by 10:30 pm EST, with the majority of the results available by 1 AM EST tomorrow.
At about 5:30 PM EST, a leader from the "no" campaign predicted a 10% point win, and said that there had been 70% turnout. The "no" campaign also criticized the last minute wave since Thursday of government publicity (disguised as "interviews") in violation of the media blackout on the referendum.
The "yes" campaign refuted the prediction about an hour ago, saying it wasn't possible to know the result.
Radio Dignidad, associated with the "no" campaign, is running live coverage as we speak.