Mitt Romney finds voice in presidential race in Tampa

US presidential hopeful, Mitt Romney, has made what could be the most important speech of his career - an address to the Republican party convention in Florida.

This was billed as a moment like no other in the presidential election campaign.

He had the attention of his party faithful, but also that of the tens of millions of TV viewers around the country as they prepared to vote in November.

Steve Kingstone reports.