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Polls open in Zimbabwe on Friday for the disputed one-man presidential runoff. Opposition candidate Morgan Tsvangirai pulled out of the race citing concerns for his supporters' lives. That leaves President Robert Mugabe as the only candidate on the ballot. International leaders have condemned the election.

Democratic candidate Barack Obama announced Thursday he won't take part in the public-finance system for the presidential campaign. Obama becomes the first candidate in a general election to opt out of the primary system.

Hundreds of gay and lesbian couples tie the knot as same sex-marriage becomes legal in California. San Francisco's City Hall was a popular spot Tuesday.

Officials in Afghanistan on Wednesday said it launched an operation to drive Taliban insurgents from villages on the outskirts of Kandahar. Afghan government troops have been joined by Canadian forces in the operation.

The Supreme Court has outlawed executions of people convicted of raping a child. The court was considering a Louisiana law that allowed for such executions. The ruling said the law violates the Constitution's ban on cruel and unusual punishment.

Intelligence agencies are debating the effects of climate change on national security. A classified assessment delivered to Congress concludes that rising global temperatures would indirectly present a security threat to the United States.

Two top intelligence officials have testified in Congress about the implications of climate change for U.S. national security. They discussed an assessment that identifies parts of the world where climate change could produce political instability.

In California, two elderly women were one of the first same-sex couples to marry in the state. Their marriage begins a busy week for county registrars around the Golden State. The state's Supreme Court decision legalizing same-sex marriage took effect Monday.

Barack Obama's presidential campaign said Wednesday that Jim Johnson, the head of Obama's vice-presidential selection team, resigned. Presumptive GOP presidential nominee John McCain has said Johnson was the type of Washington insider the Illinois senator promised to campaign against.

The Supreme Court ruled Thursday that terrorism suspects held at Guantanamo Bay have the right to challenge their detention in U.S. courts. It's the third time the high court has ruled against the Bush administration over its treatment of detainees in the war on terrorism.