Well, this surely isn’t the only reason, but he’s up for reelection in 2012 and Napolitano was seen as his chief rival. Now, for all intents and purposes, she’s off the table unless she wants to leave the DHS after a few years and start running for the Senate. That’s certainly not unthinkable, but definitely not as likely as if she stayed Governor.

In any event, here’s his statement from The Page:

Washington, D.C. – U.S. Senator John McCain (R-AZ) today commended the announcement of Arizona Governor Janet Napolitano as top contender for Secretary of the Department of Homeland Security and made the following statement:

Today, Senator McCain called and congratulated Governor Janet Napolitano on her emergence as top contender for Secretary of the Department of Homeland Security. Senator McCain said “Governor Napolitano’s experience as the former U.S. Attorney for Arizona, Arizona’s Attorney General, and as Governor warrants her rapid confirmation by the Senate and I hope she is quickly confirmed.” Senator McCain looks forward to working with her throughout the nomination process.

By the way…so far everybody’s playing nice during this process and we’re definitely still in that honeymoon period. But…when do you think the other shoe will drop? Will it be a policy matter or a staffing selection?

Politics McCain Praises Napolitano Pick