You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "Since when has the incumbent challenged by R.J. Harris in 2010 served in Congress?" whose answer is 2003.
Each document should contain about 30 words, and these documents should contain useful information.

Query: R.J. Harris congressional challenge 2010
Useful Output:

Doc 1: In 2010, he unsuccessfully challenged incumbent Tom Cole for the Republican Party nomination in the primary election for Oklahoma's 4th congressional district.
Doc 2: Requires the Committee to: (1) establish goals and priorities for advanced manufacturing research and development that will strengthen U.S.
Doc 3: In midterm election races across America, Republicans pummelled their opponents, capturing the House of Representatives and a fistful of Senate seats.
Doc 4: He ended his presidential campaign in April 2012 and announced his congressional bid. 2010. In 2010, Harris challenged incumbent Rep. Tom Cole for the
Doc 5: This paper aims to provide a comprehensive review of 3D printing techniques in terms of the main methods employed, materials utilised, its