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Voters in more than 20 states will have their say Tuesday on who should be the presidential nominees. The Republican presidential contenders madly crisscross the country, getting in as many appearances as possible, three days before the Super Tuesday contests.

Exit polls show Arizona Sen. John McCain is picking up support from pro-choice voters, but his record shows he is consistently anti-abortion. Many voters appear to assume, incorrectly, that abortion is among the issues on which McCain has split with his party.

How long will U.S. troops occupy Iraq? The Pentagon plans to withdraw some troops between now and mid-summer. A clearer picture will emerge when Gen. David Petraeus briefs lawmakers in April.

The candidates have differing positions on what to do going forward in Iraq. But much of their campaign rhetoric has been backward-looking — questioning each others' support for, or opposition to, the war.

On Thursday, Microsoft announced a whooping $44.6 billion bid for Yahoo, a merger that would give Google a run for the money. A deal that combines the second and third largest online search companies is likely to attract antitrust review. Greg Sidak, U.S. editor of the Journal of Competition Law and Economics offers some insight.

While John McCain won big on Super Tuesday, fellow Republicans Mike Huckabee and Mitt Romney received far more support from the Republican Party's traditional conservative base. That could spell trouble — not only for McCain in a general election, but for the party as a whole.

On Super Tuesday, 24 states will have presidential primaries or caucuses. What happens will decide one or both parties' nominees — or maybe not. Michele Norris talks with Mara Liasson, who previews what's at stake in a most unpredictable year.

Arizona Sen. John McCain reinforced his lead among GOP candidates with big wins in California and New York, while results show Democrats Hillary Clinton and Barack Obama with a long fight ahead to win the nomination. Political analysts Stephanie Cutter and Sarah Taylor sort through Super Tuesday results.

The list of nominees for the 80th Academy Awards are announced. No Country for Old Men and There Will Be Blood both earn eight nominations, leading the field.

Actor and former Tennessee Sen. Fred Thompson dropped out of the Republican presidential contest Tuesday. He had said he needed to win in South Carolina, but finished third there. Melissa Block talks with Rich Galen, former senior adviser to the Thompson campaign.