Warren Buffett, the billionaire head of Berkshire Hathaway and third richest person in the world, has called repeatedly for increasing taxes on wealthy Americans to help reduce the nation’s deficit. So last week, GOP presidential hopeful Rep. Michele Bachmann called on Buffett to put his money where his mouth is. “Mr. Buffett, write a big check today,” Bachmann said on the campaign trail. “There’s nothing you have to wait for.” Bachmann is right: Donations to the federal government can be dropped in mailboxes and sent to a West Virginia post office box, or they can be submitted online at http://www.pay.gov.