Rep. Darrel Issa, R-CA $355.38 million
Issa first made his fortunate founding Directed Electronics - a car alarm manufacturing company in Vista, Ca. - though now he makes his money in the stock market. According to Roll Call, he ended 2012 with at least $390 million in bonds and stocks. Between 2007 and 2009, Issa secured $815,000 in earmarks to widen a road less than a mile from a medical building in Vista, Ca., that Issa purchased for $16.6 million in 2008. He sold the property the following January for $15 million. – The Washington Post