Former John McCain opponent Fred Thompson hailed the senator as a man of "strength, courage, humility, wisdom, duty and honor," Thursday.
In his speech to the Republican National Convention, Thompson took delegates through stories of McCain's military experience, and what he endured as a prisoner of war.
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"John McCain is a candidate that has been tested like that of no other presidential candidate in the history of this country," Thompson said. "We hear a lot of talk these days about hope. John McCain knows about hope. That's all he had," he later added. Click here to watch Fred Thompson's entire speech.
Thompson told supporters that the GOP has a candidate they know and can trust. McCain has "character you can believe in," he said.
"While others were talking reform, John McCain led the effort to make reform happen, always pressing, always moving for what he believed was right and necessary to restore the people's faith in their government," Thompson added.
Thompson also took the time to lift up McCain's running mate, in light of the media frenzy of news about Gov. Sarah Palin's pregnant teenage daughter.
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"What a breath of fresh air Gov. Sarah Palin is," he said. "It's pretty clear the selection of Gov. Palin has the other side and their friends in the media in a state of panic. And no wonder. She is a courageous, successful reformer who is not afraid to take on the establishment."
Sticking to the issue of abortion, Thompson bashed Barack Obama on his stance on this issue.
"We need a president who doesn't think that the protection of the unborn or a newly born baby is above his pay grade," Thompson said, referring to a comment Obama made at last month's Saddleback Church forum. "The man who will be that president is John McCain."
Thompson's speech was one of many delivered Tuesday night that switched the convention's focus from the victims of Hurricane Gustav back to politics.
He spoke just before Sen. Joe Lieberman, who took the prime time spot to endorse McCain.