George H.W. Bush To Back McCain

A Republican source tells CBS News that former President George H.W. Bush will endorse John McCain on Monday morning in Houston, Texas.

Mr. Bush is the latest high-profile Republican to throw his support behind McCain, who is now trying to consolidate Republican support in the face of some conservative opposition. Former bitter rival Mitt Romney endorsed McCain yesterday.

Mike Huckabee, the former Arkansas governor who has shown particular strength with Southern voters, remains in the race despite mounting pressure to pull out to ease McCain's transition to a general election fight.

As the Associated Press notes, the current president has not formally endorsed McCain, but he suggested in an interview on Sunday that the presumptive nominee had his backing. President Bush called McCain a "true conservative" but said the Arizona senator had "some convincing to do" to win over critics like Rush Limbaugh.