Another update:

Clinton 13
JFK 12
Truman 11 (Visited the Truman Library June 2010 he was an impressive fellow under fire)

Reagan 11
Ike 9
Obama 5
Nixon 4
Carter 3
Ford 2
FDR 1
H Bush 1
LBJ 1
W Bush 0

Any mistakes made in my tally are totally unintentional...