George Barrett
Company: Cardinal Health
Fortune 500 rank: 21
Total 2011 political contributions: $7,200
Largest contribution: $2,500 to Sen. Sherrod Brown (D-Ohio)
Lowell McAdam
Company: Verizon Communications
Fortune 500 rank: 15
Total 2011 political contributions: $5,000
Largest contribution: $2,500 to Sen. Robert Menendez (D-N.J.)
William Klesse
Company: Valero Energy
Fortune 500 rank: 12
Total 2011 political contributions: $3,500
Largest contribution: $2,500 to Elizabeth Jones (R-running for Texas State Senate)
Jamie Dimon
Company: J.P. Morgan Chase & Co.
Fortune 500 rank: 16
Total 2011 political contributions: $2,500
Largest contribution: $2,500 to Sen. Mitch McConnell (R-Ky.)
Larry Merlo
Company: CVS Caremark
Fortune 500 rank: 18
Total 2011 political contributions: $1,000
Largest contribution: $1,000 to President Barack Obama
