A decisive victory, though, is still critical to the race, he said in an interview on "Fox News Sunday."
"I don't think one event is going to make or break this campaign. President Obama is a very ... gifted speaker. ... I think what people are going to see [is] who is Mitt Romney, what kind of a president he is going to be and what are the choices I have," he said.
Ryan said the debate will present Americans with a clear choice come election day in November.
"We owe the country a very clear choice of a different future. ... We can stick with the failed policies of the ... last [four] years for the next four years, or we can get a brighter future," he said.
Ryan pointed to what he called the Obama administration's "weak foreign policy" as an example of how different the policies of the two camps are. He called the president's response to the terrorist attack in Benghazi, Libya, that killed four Americans slow, confused and inconsistent.
"We're seeing the ugly fruits of the Obama foreign policy unravel around the world on our TV screens. Syria, you've got 20,000 dead people. Iran is closer toward a nuclear weapon. The Middle East peace process is in shambles and we have our flags being burned all around the world. Russia is thwarting us at every stage in the process. This is a weak foreign policy with terrible results which makes us less safe," Ryan said.
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