RWN's readers were polled on this question and there were more than 1300 responses. Here's how the numbers broke out,

Rick Perry: 0% (3)
Rob Portman: 0% (4)
Mike Pence: 1% (8)
John Thune: 1% (9)
Tom Coburn: 1% (17)
Kay Bailey Hutchison: 1% (18)
Mark Sanford: 2% (25)
Joe Lieberman: 2% (27)
Rudy Giuliani: 2% (32)
Colin Powell: 3% (34)
Tim Pawlenty: 3% (38)
Sarah Palin: 3% (41)
Mike Huckabee: 3% (43)
Marsha Blackburn: 4% (49)
Jim DeMint: 4% (54)
Condi Rice: 9% (118)
Mitt Romney: 10% (134)
Duncan Hunter: 12% (155)
JC Watts: 14% (181)
Fred Thompson: 24% (315)

Given that we're talking about "Mr. Maverick" here, these results are probably a pretty good indication that either Rick Perry or Rob Portman has an inside track on the VP slot.