If you missed Obama's speech last night, click here to see it and all our commentary.
Here's a roundup of some of the early reactions from America.
The Caucus: Live from Denver
He has been casting himself as an economic populist in the last few weeks, and it was no surprise that he continued to do that here. But it was striking the degree to which he did so, focusing on the economy almost exclusively for the first two-thirds of his speech — a measure both of how central it is for many voters but also of how much he wants to appeal to Reagan Democrats.
Peggy Noonan in The Wall Street Journal: Obama gets serious
The speech itself lacked lift but had heft. It wasn't precisely long on hope, but I think it showed audacity. In fact, by the end of the speech I thought it was quite a gamble.
Jonah Goldberg in The Corner: In all seriousness
I think his shots at McCain were ill-advised. Who the hell is Obama to try to out-hawk McCain on Bin Laden? Please. Not plausible. What is Obama talking about when he tries to suggest there are more Republicans for Obama than there are Democrats for McCain? C'mon.
Joe Klein in Time: Obama's speech 'very tough'
He stood there not as an orator, but as a plausible chief executive. His message was as tight as a power-point presentation, but far more elegant. And tough — above all, tough: not an egghead, not Adlai Stevenson. No, tonight Barack Obama was a politician from the south side of Chicago, ready for the brawl of his life
John Dickerson in Slate: Back to earth
It was the single most emphatic word of his address. Change is all well and good, but when Dad says, "Enough," the kids stop fooling around. It conveys an urgency and determination that talk of change simply does not. You could see that single word printed on placards for future rallies.
Jonathan Cohn in The Plank: Less glamour, more grit
Four years ago in Boston, I watched Barack Obama deliver perhaps the most perfect speech I’ll ever see....Tonight, on television, I watched Barack Obama give a rather different piece of oratory. Although delivered with equal skill, its content struck me as more unwieldy and, at times, more pedestrian.
Dan Balz in The Washington Post: The message that the party wanted to hear
Obama was under considerable pressure Thursday night to deliver a speech of special force and power. What he gave here was a combination of old and new -- new toughness coupled with the message that got him to this point.
Justin Webb's America: A clever performance
He brought it off. I thought at one stage that the Doric columns (if that is what they were) might fall on him (metaphorically) but they did not. He is too clever for that.
Doyle McManus in the LA Times: Obama gets it in gear with acceptance speech
The new Obama, unveiled before about 84,000 cheering supporters in a football stadium, is more combative than the old Obama -- and more sharply focused on the economic problems of the nation's working class
Andrew Sullivan in The Daily Dish: The hope we confess
Above all, he took on national security - face on, full-throttle, enraged, as we should all be, at how disastrously American power has been handled these past eight years. He owned this issue in a way that no Democrat has owned it since Kennedy. That's a transformative event.
Jacob Heilbrunn in The Huffington Post: Obama goes on the offence
Obama showed that he does not conform to the image of the Democrat as wussbag by directly assailing McCain's foreign policy credentials -- specifically, his claim that he would "follow" Osama bin Laden to the "gates of hell." But why just follow? As Obama made clear, he needs to be taken out.
Paul Krugman in The New York Times: Feeling no pain
My first reaction to Bill Clinton’s convention speech was sheer professional jealousy: nobody, but nobody, has his ability to translate economic wonkery into plain, forceful English.
Editorial in The New York Times: Mr. Obama’s Party
Mr. Obama long ago proved his skills as an orator. He went further on Thursday night, using his acceptance speech to add detail to his promises of hope and showcase a new theme that could find resonance with Democrats, new and old, and a broader range of Americans.