Baghdad, Iraq ? The two strongest opponents of Iraq’s proposed new constitution said this week that they wouldn’t campaign against it aggressively, making it likely that voters will approve the constitution in an Oct. 15 referendum.

Passage would be a victory for the Bush administration’s Iraq policy, but it’s unclear whether the document will produce a stable Iraqi government with broad public support or further alienate the country’s Sunni Muslim Arab minority.

Rebel Shiite cleric Muqtada al-Sadr’s representatives said that while he’s not thrilled about the constitution, he likely wouldn’t encourage his followers to oppose it.

The largest Sunni political group, the Iraqi Islamic Party, said that although it has encouraged its supporters to vote down the document, its efforts are focused on the December election for a new National Assembly.

“There are powers that will make sure this bad constitution passes,” said Ala’a al-Maki, a party spokesman. “We are focusing more on ensuring the Sunnis participate in the next election.”