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Democratic Sen. Barack Obama made history last night when he became the first African-American to win a major party nomination. His victory comes after one of the hardest-fought presidential primary contests in U.S. history. Political strategists Sara Taylor and Stephanie Cutter discuss the weight of Obama's win.

Health officials are trying to identify the source of the salmonella contamination that has made more than 100 people ill. Tomatoes are thought to be the culprit. The Food and Drug Administration is urging consumers to avoid certain types of tomatoes.

The U.S. Supreme Court ruled Thursday that detainees at Guantanamo Bay, Cuba, have the right to seek their release in federal court. The 5-4 decision was a stinging rebuke to President Bush's anti-terrorism policies, and reaction from law experts and Bush allies was swift.

The Supreme Court is pushing toward the end of its term, and on Wednesday morning the justices issued a raft of important decisions dealing with the death penalty, punitive damages and confronting witnesses.

Former White House Press Secretary Scott McClellan insists his scathing memoir is not the work of a disgruntled ex-employee — as some of his old colleagues have argued — but an effort to tell the truth to help clean up Washington.

Turns out wireless networks aren't wireless at all. And light pulses in fiber optic cables carry your voice around the world. A new exhibition explains the science you hold in your hand every day.

Child welfare officials in Texas say they'll take immediate steps to comply with a state Supreme Court ruling that children removed from a polygamist compound be reunited with their parents. The court said welfare officials overstepped their authority.

Nervous employers slashed nearly 50,000 jobs from their payrolls in May, sending the unemployment rate up to 5.5 percent for the month. It was the biggest monthly increase in the rate in 22 years.

Sen. Hillary Clinton's campaign released a statement Wednesday night saying the senator would host an event Saturday in Washington, D.C., and that she will "thank her supporters and express her support for Sen. Obama and party unity."

As Russia swears in a new president, observers question whether the leader, Vladimir Putin's successor, will have real power to chart his own course for the country. He takes over a nation with a booming oil economy, and many serious problems.