BASIC FACTS
Four candidates: 2 reformists, 2 conservatives
Vying for 4-year termWinner needs 50 percent plus one vote
Top 2 candidates go to 2nd round if necessary
Officials expect high turnout
64 million eligible voters
Polls open at 8 A.M. local time
Voting to continue for at least 10 hours
WHO'S RUNNING?
President Mahmoud Ahmadinejad
Ex-Prime Minister Mir Hossein Mousavi
Ex-Revolutionary Guards commander Mohsen Rezaei
Ex-Parliament Speaker Mehdi Karoubi
WHAT ARE THE ISSUES?
Economy: inflation, unemployment
Foreign policy
Relations with West
Nuclear program
