Why does McCain accuse Obama of Flip-Flops on issues when he is the "Godfather" of Flip Flops?

He has "Flip-Flopped" on: Oil Drilling, Gay Marriage, Abortion, Tax Cuts, Ethanol, Cuba Position, Immigration, Confederate Flag, Iraq War, Privatizing Social Security, Iraq Withdrawal Timetable, Hamas Position, Torture, Religious Right, Death Tax, English Official language, War For Oil & oh-so-much-more!