Paul Ryan stands by remark blaming Obama for U.S. credit downgrade

On Thursday afternoon, Republican presidential nominee Mitt Romney ran into his running mate, Paul Ryan -- and told him he set a high bar for a successful speech.

Ryan brought the delegates to their feet Wednesday at the Republican National Convention with a sharp critique of the president's economic record.

He spoke to CBS Evening News anchor Scott Pelley about several of the points he made in the speech.

Among the barbs was a suggestion that President Obama was responsible for a downgrade of the U.S. government's credit rating by that ratings firm Standard and Poor's during a budget and debt ceiling debate in Congress last summer.

Pelley confronted Ryan on that point, reading from the S&P's own report saying that it was Republicans' refusal to accept any revenue-raising measures that prompted the credit downgrade.

Watch a clip of the exchange below: