In this June 25, 2009 photo, Sen. John McCain, R-Ariz. watches as President Barack Obama meets with members of Congress to discuss immigration, in the State Dinning Room of the White House in Washington. Obama and McCain, the Republican he defeated in his first White House campaign, have become one of Washington’s most talked about odd-couple pairings. And like any successful business deal in the nation’s capital, the relationship works because it has benefits for both men. (AP Photo/Haraz N. Ghanbari, File) WASHINGTON (AP) — There was no conciliatory phone call, no heart-to-heart talk to soothe the tensions. No one knows exactly when President Barack Obama and Republican Sen. John McCain went from bitter rivals in the 2008 presidential campaign and foes over health care and national security to bipartisan partners.