Lebanese streamed to their hometowns on the Mediterranean coast and high up in the mountains Sunday to vote in crucial elections that could unseat a pro-Western government and install one dominated by the Iranian-backed militant group Hezbollah.

The race for the 128-member parliament is viewed by many as setting Lebanon’s political course for the next four years, with repercussions beyond this tiny Arab country’s borders. A win for the Shiite militant group, which the United States considers a terrorist organization, and its allies could bring isolation to Lebanon and possibly a new conflict with Israel.

It could also set back U.S. Mideast policy and boost the influence of Shiite Hezbollah’s backers Syria and Iran.

Lebanon has long been a main front in what many see as a power struggle between two main camps in the Mideast — the U.S. and its moderate Arab allies Saudi Arabia and Egypt on one side, and Iran and Syria and militant groups such as Hezbollah and the Palestinian Hamas on the other.

A steady stream of vehicles headed south, north or east from Beirut on highways to outlying parts of the country early Sunday morning, a weekend here, carrying voters to hometowns. Some vehicles had flags of political groups fluttering to show loyalty.

Voters lined up outside polling stations in government buildings and public schools across the country after polls opened at 7 a.m. (0400 GMT). Voting ends 12 hours later. There are some 3.2 million eligible voters out of a population of 4 million. Early unofficial returns were expected late Sunday and official results as early as Monday afternoon.

Army troops in armored carriers and in trucks took up positions on major highways to ensure peaceful voting. Authorities have deployed some 50,000 soldiers and police.

Scores of foreign observers, including former President Jimmy Carter, will monitor the vote.

Going into the election, the race for a majority appears too close to call. In the outgoing parliament, the pro-Western bloc had 70 seats and Hezbollah’s alliance had 58.

The vote is the latest chapter in four tumultuous years for Lebanon that began with the assassination of former Prime Minister Rafik Hariri in 2005 in a car bombing. The pro-Western factions swept into power in elections the same year on a sympathy vote. But the government has been virtually paralyzed since by the power struggle with Hezbollah.

The campaign has been bruising, with accusations of vote-buying by both sides.

Hezbollah’s coalition includes the Shiite movement Amal and a major Christian faction led by former army chief Michel Aoun. Opposing it are the overwhelmingly Sunni Muslim supporters of current majority leader Saad Hariri, allied with several Christian and Druse factions.

Lebanese tend to vote mainly along sectarian or family loyalties. Sunni Muslim and Shiite Muslim districts around the country are largely locked up, so the battle has been over the Christian districts, where some races are a tossup. There are no reliable, independent polls.

Hezbollah’s Christian allies argue that a victory by their coalition will not have such a dramatic impact and will ensure peace in a nation divided by sectarian tensions. They say that involving Hezbollah more deeply in the political process — rather than shunning it — is the only way to bridge the sectarian divides.

Their opponents counter that the heavily armed Hezbollah would be driving Lebanon into the arms of Iran, which could use it as a front in the Islamic republic’s confrontation with Israel.

Tags: Arab Country, Army Troops, Eligible Voters, Former President Jimmy Carter, Government Buildings, Hezbollah, Hometowns, Mediterranean Coast, Member Parliament, Mideast Policy, Militant Groups, Palestinian Hamas, Political Groups, Polling Stations, Power Struggle, President Jimmy Carter, Shiite Militant Group, Syria And Iran, Unofficial Returns, Western Government