On Monday, he said he didn't remember the specific circumstances of the contribution. Made days before the election, Jenkins said the money "was certainly not an early support in which he could put it to much use that election cycle."
In December 2009, Rahall's committee made a non-federal contribution of $2,000 to the "Friends to Re-Elect Senator Evan Jenkins" campaign committee, according to federal elections data.
In April 2010, Jenkins' committee returned $1,000 of the contribution to Rahall's committee, records show. Jenkins pointed to a state law allowing a maximum of $1,000 contribution for the primary election and a $1,000 contribution for the general election.
"I had a legal responsibility to return the $1,000 that he was not allowed to contribute," Jenkins said. "I live by the letter of the law."
Jenkins said he thinks the 2010 contribution is the only one he's made to Rahall, but he wasn't positive. Federal elections documents, along with campaign finance websites
FollowTheMoney.org and Open
Secrets.org, indicate Rahall and Jenkins did not make any other contributions in recent elections.
Both men won their elections in 2010. It marked the 18th successful congressional campaign for Rahall and Jenkins' third consecutive successful election to the Senate.
Neither Rahall nor Jenkins has filed to run for any office in 2014 yet, according to the secretary of state's website.
Jenkins said Monday he's been outspoken, especially recently, in his criticism of "Washington." He specifically mentioned his dissatisfaction with the Patient Protection and Affordable Care Act - he called it "Obamacare" - and the administration's "war on coal."
Beating Rahall in 2014 is a top priority for the National Republican Congressional Committee, a national organization committed to keeping a Republican majority in the U.S. House. The group is already spending money on an advertising campaign, criticizing Rahall and comparing him with national Democrats who are largely unpopular in West Virginia.
State Democrats have fired back. State party chairman Larry Puccio recently told the Daily Mail he believes the state Republican Party is "either unable or unwilling to find viable candidates from within their own party who share their beliefs."
No candidates have filed for the race yet, according to the secretary of state's website.