By Kevin Bogardus - 08/20/13 09:00 AM EDT
Issa, who made his riches with the Viper car security system, snatched the No. 1 spot away from Rep. Michael McCaul (R-Texas), who came in second with a net worth of at least $101 million.
Overall, the Republican Party has the edge on The Hill's list for the third year in a row, with 29 of the 50 lawmakers coming from the conservative side of the aisle.
Thirty-seven of the lawmakers on the list are from the House, with the remaining 13 coming from the Senate.