"He has great appeal to the Republican rank and file but he can walk the middle ground when he has to," Redlawsk said. "He's the tough guy who can tell it like it is, and it's very valuable to Romney to have him in that role."

Christie's effectiveness as an economic messenger has been undercut recently by a slumping New Jersey economy that has shed jobs and now has the fourth-highest state unemployment rate, 9.8 percent, higher than the national average of 8.3 percent.

The so-called "Jersey Comeback" previously trumpeted by Christie has begun to ring hollow.

"There are three words that are not in my speech on Tuesday night: The Jersey Comeback," he told state reporters. "Those three words aren't in, and were never in.”

Questions:

1. Who will give the keynote speech at the Republican National Convention?

2. Who is the Republican presidential candidate?

3. Chris Christie is the governor of which state?

Answers:

1. Chris Christie.

2. Mitt Romney.

3. New Jersey.

About the broadcaster:

CJ Henderson is a foreign expert for China Daily's online culture department. CJ is a graduate of the University of Sydney where she completed a Bachelors degree in Media and Communications, Government and International Relations, and American Studies. CJ has four years of experience working across media platforms, including work for 21st Century Newspapers in Beijing, and a variety of media in Australia and the US.

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