Mitt Romney has formally accepted the Republican Party's nomination to run in this November's presidential election against Barack Obama.
He accepted the party's nomination on the third and final day of the Republican Party's national convention in Tampa, in the southern state of Florida.
"Mr. Chairman and delegates, I accept your nomination for president of the United States," Romney said.
"I do so with humility, deeply moved by the trust you've placed in me; it's a great honor, it's an even greater responsibility, and tonight I'm asking you to join me to walk together to a better future."
Romney said Obama had failed to deliver on his promise of hope and change. Romney cast himself as the best hope to lift the struggling U.S. economy and "restore the promise of America."
Romney noted excitement over Obama's promises from his campaign four years ago "gave way to disappointment and division."
Romney also promised to restore "U.S. leadership" on the world stage, promising a tougher stance against Iran over its nuclear program and a harder line against Russian President Vladimir Putin.
Romney also tried to show a softer side, describing his parents and family and defending his work at Bain Capital, the private equity company that critics have accused of raiding companies and cutting jobs.
Romney's speech, which launches a two-month dash to the November 6 election, was seen by tens of millions of television viewers and gave some their first extended look at the former Massachusetts governor.
Romney and Obama have been running close in polls ahead of the election, but the convention so far has given Romney a boost.
Based on reporting by Reuters and AP