Not entirely baseball, but...

[Brian McKenna]

What do Andrew Jackson, Teddy Roosevelt, Gerald Ford, Ronald Reagan and George W. Bush have in common?

Only U.S. Presidents to _______________________________________at one time or another.

most did this prior to their term in office

[RuthMayBond]

Attend opening day/throw out first pitch?

[Brian McKenna]

Guess this one is not coming through too well.

Going for:
earn a living through sports.

Jackson - bred and raced horses
Roosevelt - outdoor writings
Ford - Yale football coach
Reagan - baseball braodcaster
Bush - baseball executive