USA Today reports:

New Jersey Gov. Chris Christie will deliver the keynote address that launches the Republican National Convention in two weeks, telling USA TODAY he plans to make an "emphatic" argument on behalf of GOP approaches and shared sacrifice to face the nation's biggest challenges.

In an interview Monday, Christie said his 20-minute speech will focus more on making the case for electing Mitt Romney than the one against re-electing President Obama. And he promises the words will be his own: He's already on the fourth draft of the speech, "grinding away on it" over the past few days since Romney asked him to fill the high-profile role.

And Florida senator Marco Rubio writes on Twitter:

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