.  As presidential candidates gear up for the 0000 election, their super PACs -- which can accept unlimited donations as long as they don't coordinate spending with the campaign -- eye wealthy businessmen who can donate large sums of cash. Here's a look at well-known donors who have given money to conservative presidential campaigns in the past.  As presidential candidates gear up for the 0000 election, their super PACs -- which can accept unlimited donations as long as they don't coordinate spending with the campaign -- eye wealthy businessmen who can donate large sums of cash. Here's a look at well-known donors who have given money to conservative presidential campaigns in the past.  