Sen. John McCain (R-Ariz.) is selling himself to Arizona voters as the man “leading the fight against President Obama— in the first ads of his re-election campaign.

In two radio spots released Thursday, McCain goes out of his way to bash his 2008 presidential foe and uses stark terms to frame his differences with the current president’s agenda. In the first, an announcer says McCain is in a “battle to save America,— with McCain himself claiming Obama “is leading an extreme, left wing crusade to bankrupt America.—

“I stand in his way every day,— McCain adds.

In the second, the announcer reminds listeners of McCain’s well-documented time as a POW in Vietnam, and goes on to say that he is still “standing up to titans, afraid of no man.—

Both ads end with the line, “John McCain is Arizona’s last line of defense.—

McCain currently has a clear path to re-election for a fifth term, but that could be complicated if former Rep. J.D. Hayworth takes him on in a Republican primary. Hayworth, a staunch conservative who lost his 2006 race for re-election in the 5th district, has confirmed that he is exploring a campaign.