McCain, you'll recall, used the phrase "Country First" as one of his slogans during that campaign, and the phrase was prominently featured during the Republican National Convention.
McCain sent an email to supporters saying the group will promote Republican causes and candidates and work to help the GOP redefine itself.
"Country First will allow us to strengthen our party, better define our Republican ideals and message, recruit and back strong, dedicated candidates, and continue our efforts to bring real reform to government by always putting our country and the noble ideals she stands for first," he wrote in the email.
The PAC will also, the New York Times points out, likely help lay the groundwork for the 72-year-old senator's 2010 reelection campaign.
"The road was a difficult one from the outset," McCain wrote to supporters. "Yet, your faith, your support and friendship never wavered. Just as I have proudly served my country for more than half a century I am as committed as ever to helping see our mission through."