[Flycatcher]

To date, McCain does not have a serious challenger within the party

And he may not either, for this reason (from the CNN article):

The presence of Palin - and the considerable crowds and media attention she will draw - might give pause to J.D. Hayworth

It's perfidy!

[onyx]

JD Hayworth has been “mulling” a run for a good many weeks, or is it “months” now?

It's “now or never” time for JD and Sarah shouldn't stop him. JD has Sheriff Joe on his side.

[excopconservative]

McCain probably considers Chris Simcox, the founder of the Minuteman Civil Defense group, a serious challenger. He is the only Republican opponent and immigration is a big issue for Republican voters in AZ. He may have been concerned that Sarah would go rogue on him and endorse Simcox thus he probably asked for the endorsement.

I don’t see where she has been untrue to any principles. Simcox would not win in a general election in AZ and the goal in 2010 is to retake the Senate and the House.