Sen. Joe Manchin (D-WV), who won his seat in a special election in 2010, filed paperwork with the Secretary of State's office Wednesday to run for a full, six-year term.
His opponent two years ago, John Raese (R), filed to run last week.
Manchin has spent much of his time in Washington trying to distance himself from President Barack Obama, including on issues related to the EPA and key provisions of the health care reform law.
You may remember during the 2010 campaign when he released a commercial featuring him shooting the cap-and-trade bill after Raese released ads calling him "Washington Joe."
When he talked with reporters Thursday, Raese spent a good amount of time trying to link Manchin to Obama as much as possible.
In their previous matchup, Raese tried to employ those themes in a year when Republicans dominated races nationwide. Yet, he still lost to Manchin by 10 percentage points.
Manchin and Raese are the only candidates who have filed to run for the seat so far.
In a statement Manchin said, "As West Virginians know, I will stand up against anyone whose policies will hurt our state, our families and our future. It is why I am proud to have stopped the cap-and-trade bill, which would have hurt so many families and businesses in our state. And I will continue to stand up to protect Social Security and fight against unfair trade agreements that will continue to destroy hundreds of thousands of American jobs and send those jobs to other countries."