I think the strongest arguments he may use will be the fact that some corporations manage to fix their books so that they pay no taxes whatsoever (sort of like Greece?).
A second argument he has is the extremely high salaries that CEOs and other high executives earn. Personally I was outraged when my GE stock was dropping from $50 to $5 a share, and then I saw that the top seven executive were paid from $11 to $22 million a year during and after that whole debacle. Stockholders of Goldman Sachs were similarly outraged in 2008 (remember the bank failures and economic crash of 2007), when they learned the top 3 executives each earned over $65 million. In fact they were so angry that 43% of them voted for a Proposal for a Stockholders’ Advisory on Executive Compensation. The following year the CEO’s salary had dropped to a mere $25 million and after that it became very hard to find that information. Check out Forbes CEO Compensation at Google to see more about just how outrageous CEO salaries have become.
Those that bash the rich, CEOs and corporations are liberals and socialists. Apparently Obama supporters have infiltrated free republic.