In-depth coverage of the candidates and the issues, all leading up to the Aug. 5 primary and the Nov. 4 general election.
Democratic National Convention
Denver Surrounded by an enormous, adoring crowd, Barack Obama promised a clean break from the "broken politics in Washington and the failed policies of George W. Bush" Thursday night as he embarked on the final lap of his audacious bid to become the nation's first black president.
"America, now is not the time for small plans," the 47-year-old Democratic Illinois senator told an estimated 84,000 people packed into Invesco Field, a huge football stadium at the base of the Rocky Mountains.
He vowed to cut taxes for nearly all working-class families, end the war in Iraq and break America's dependence on Mideast oil within a decade. By contrast, he said, "John McCain has voted with President Bush 90 percent of the time," a scathing indictment of his Republican rival - on health care, education, the economy and more.
Polls indicate a close race between Obama and McCain, the Arizona senator who stands between him and a place in history. On a night 45 years after Martin Luther King Jr. delivered his "I have a Dream Speech," Obama made no overt mention of his own race.
"I realize that I am not the likeliest candidate for this office. I don't fit the typical pedigree" of a presidential candidate was as close as he came to the long-smoldering issue that may well determine the outcome of the election.
Fireworks lit the night sky as Obama, his speech concluded, accepted the cheers of supporters. His wife, Michelle, and their daughters Malia and Sasha joined him as the country music anthem "Only in America" filled the stadium. Vice presidential running mate Joseph Biden and his wife, Jill, joined them onstage.
Depicted by McCain as too young and inexperienced to sit in the Oval Office, Obama responded with an oblique reference to his rival's temper.
"If John McCain wants to have a debate about who has the temperament, and judgment, to serve as the next commander in chief, that's a debate I'm ready to have," he said.
Campaigning as an advocate of a new kind of politics, he suggested at least some common ground was possible on abortion, gun control, immigration and gay marriage.
Obama delivered his 44-minute nomination acceptance speech in an unrivaled convention setting, before a crowd of unrivaled size - the filled stadium, the camera flashes in the night, the made-for-television backdrop that suggested the White House, and the thousands of convention delegates seated around the podium in an enormous semicircle.
Obama and his fellow senator, Biden of Delaware, leave their convention city today for Pennsylvania, first stop on an eight-week sprint to Election Day.
McCain countered the stadium extravaganza with a bold move of his own, hoping to steal some of the political spotlight by spreading word that he had settled on a vice presidential running mate. Minnesota Gov. Tim Pawlenty, former Pennsylvania Gov. Tom Ridge, former Massachusetts Gov. Mitt Romney and Connecticut Sen. Joe Lieberman were in the running.
Rep. John Lewis of Georgia spoke from the convention stage of the anniversary of King's memorable speech.
"Tonight we are gathered here in this magnificent stadium in Denver because we still have a dream," said the Georgia lawmaker, who marched with King, supported Obama's primary rival, Hillary Rodham Clinton, then switched under pressure from younger black leaders in his home state and elsewhere.
Obama's aides were interested in a different historical parallel from King - Obama was the first to deliver an outdoor convention acceptance speech since John F. Kennedy did so at the Los Angeles Coliseum in 1960.
In his speech, Obama pledged to jettison Bush's economic policy - and replace it with his own designed to help hard-pressed families.
"I will cut taxes for 95 percent of all working families. Because in an economy like this, the last thing we should do is raise taxes on the middle class," he said.
The speech didn't mention it, but Obama has called for raising taxes on upper-income Americans to help pay for expanded health care and other domestic programs.
The Democratic man of the hour paid a brief visit to members of his home-state Illinois delegation before the curtain went up on his show. "I came by (because) I had this speech tonight. I wanted to practice it out on you guys. See if it worked on a friendly audience," he joked.
There was no joking about the stakes in the speech, a once-in-a-campaign opportunity to speak to millions of voters who have yet to make up their minds between McCain and him. The polls show a close race nationally, with more than enough battleground states tight enough to tip the election either way.
Obama's hopes of victory rely on holding onto the large Democratic base states such as California, New York, Michigan and his own Illinois, while eating into territory that voted for George W. Bush. Ohio tops that list, and Democrats have also targeted Montana, North Dakota, Virginia and New Mexico, among others, as they try to expand their Electoral College map.
McCain was in Ohio as Obama spoke, and after a series of sharply negative convention week television commercials, his campaign aired a one-night advertisement that complimented Obama and noted the speech occurred on the anniversary of King's famous address.
"Senator Obama, this is truly a good day for America. Too often the achievements of our opponents go unnoticed. So I wanted to stop and say, 'Congratulations,'" McCain says in the ad.
"How perfect that your nomination would come on this historic day. Tomorrow, we'll be back at it. But tonight, Senator, job well done."