Michael Bloomberg and $22 billion
A Democrat before seeking elective office, Bloomberg switched his registration in 2001 and ran for mayor as a Republican, winning the election that year and a second term in 2005. Bloomberg left the Republican Party over policy and philosophical disagreements with national party leadership in 2007 and ran for his third term in 2009 as an independent candidate on the Republican ballot line. He was frequently mentioned as a possible independent candidate for the 2008 presidential election, which fueled further speculation when he left the Republican Party. There was also speculation that he would run as a vice-presidential candidate. Bloomberg did not, however, seek the presidency nor was he selected as a running mate by any of the presidential candidates.
In the fall of 2008, Bloomberg successfully campaigned for an amendment to New York City's term-limits law, in order to allow him to run for a third term in 2009. Bloomberg won the election on November 3, 2009.
In March 2009, Forbes reported Bloomberg's wealth at $16 billion, a gain of $4.5 billion over the previous year, enjoying the world's biggest increase in wealth in 2009. At that time, there were only four fortunes in the U.S. that were larger (although the Wal-Mart family fortune is split among four people). He moved from 142nd to 17th in the Forbes list of the world's billionaires in only two years (March 2007 – March 2009). In March 2011, his total wealth had increased to $19.5 billion, ranking 12th in the Forbes 400 and 30th in the world. As of 2012, Forbes ranks his fortune at $22 billion.
source: top10buzz
