Radio Co-Host Invite for Rob Reiner (If He Dares)

Nationally syndicated radio talk show host Hugh Hewitt has extended the following invitation to Rob Reiner:

"Mr. Reiner, you have an open invitation to co-host with me for a full week. Or a day. Or an hour."

Why do I suspect that Rob Reiner won't be willing to accept the invitation? I wish he'd do it -- and prove me wrong -- but I'm not holding my breath. Drive-by political potshots of the sort recounted here are so much easier than actually having to defend one's positions . . . live on the radio, no less.