Sort of a cryptic remark.
I think Arpaio is being sardonic!
The story also says:
“Arpaio explained he wanted to inform the candidate of his investigation ‘as a matter of fairness in case he wouldn't want me to support him.’”
IMO, it would only be “a matter of fairness” to give Santorum a chance to refuse Arpaio’s endorsement if the “something shocking” uncovered by the Posse could raise a ruckus that Santorum wouldn't want to be associated with...and Arpaio said Santorum was fine with the investigation.
However it is not exactly clear whether Arpaio told Santorum the _findings_ of the investigation, which are to be announced March 1.
Could it be that Arpaio is intending to do Obama a favor by clearing any doubt as to where he i.e. Obama was born? This could tie in with that ex Odinga compatriot publishing a book and Arpaio delaying his announcement of his posse’s findings on Obama’s eligibility for POTUSA. Could it be someone had to get safely out of Kenya? It is very interesting how many dots that existed a few years ago are now being connected.