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This holiday weekend, state troopers across the country will be stepping up their patrols. Much of their work will be routine traffic stops, but some calls they will respond to will be accidents, some of them tragic.

Retired police officer Mark Edens, 61, spent half of his career investigating fatal car accidents for the Michigan State Police.

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DAVID GREENE, HOST:

But now to Tampa, where this evening Mitt Romney will formally accept his party's nomination for president.

Last night, though, the stage belonged to vice presidential nominee Paul Ryan. In a campaign, it often falls to the running mate to be the attack dog and Ryan sounded up for the job. It was also a chance for the rising GOP star to defend his own ideas.

Here's NPR's national correspondent Mara Liasson.

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Ashrita Furman wants to build a tennis racket the size of a bus, and show it off at the U.S. Open. It's so big, he was told it's considered a building so he would need a permit.

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STEVE INSKEEP, HOST:

We're getting a reminder here of how fiercely competitive this race is. Even as his party's convention is going on, Mitt Romney, campaigning in Indiana and President Obama, of course, not taking the week off - as rival candidates sometimes do during the opponent's convention. He's been making his case the last couple of days in college towns, trying to energize young voters.

And NPR's Scott Horsley is on the road with the president.