Reagan, Bush, Clinton, and Bush have all used Apples/Macs. In the White House they are common, because they can't afford downtime due to system issues. They are also common on Capital Hill.
Rush Limbaugh spent about half of a 30 minute segment promoting Apple (this was the day after their previous earnings statement was released and the stock dropped 35%). He said he has 3 computers in his home and they're all Apple, and claimed he bought Macs for family/friends for Christmas. I imagine he's a huge Apple shareholder.
He said he only likes the "white ones". Get it? Donovan McNabb would