At CFIF, Troy Senik makes a further case for Jon Kyl. Among his four big reasons:

2. Foreign Policy Experience – Kyl has become a major figure on foreign policy in recent years, leading Republican opposition to both the New START Treaty and the Law of the Sea Treaty (both of which he has been right on, IMHO). Jindal has no commensurate experience. For Romney, who is also a foreign policy neophyte (and whose foreign policy pronouncements — identifying Russia as the nation’s largest security concern and threatening a trade war with China, for instance — have been dotty at times), having someone of Kyl’s stature would flesh out the ticket in the area where the presidency confers the greatest power — and requires the greatest responsibility.

Worth a read.