The chief inquisitor of President Obama's White House is now Congress's richest man.

House Oversight Committee Chairman Darrell Issa (R-Calif.) saw his fortune rise to at least $355 million in 2012, enough to take the crown on The Hill's 50 Wealthiest list.

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.

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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.

While several high-profile lawmakers are among the wealthiest — including House Minority Leader Nancy Pelosi (D-Calif.) and Senate Minority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellSenate Republicans signal openness to working with Biden Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll The Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally MORE (R-Ky.) — most of the leading contenders for the White House in 2016 missed the top 50.

Rep. Paul Ryan Paul Davis RyanAt indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates Peterson faces fight of his career in deep-red Minnesota district MORE (R-Wis.), the GOP's vice presidential candidate in 2012, reported a minimum net worth of $2.3 million, while conservative star Sen. Ted Cruz Rafael (Ted) Edward CruzLoeffler calls for hearing in wake of Netflix's 'Cuties' Health care in the crosshairs with new Trump Supreme Court list 'Parks and Rec' cast members hosting special reunion to raise money for Wisconsin Democrats MORE (R-Texas) posted wealth of $1.5 million.

Two other rising GOP stars, Sens. Rand Paul Randal (Rand) Howard PaulGOP senator to quarantine after coronavirus exposure The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill Overnight Health Care: Senate Democrats block GOP relief bill | Democrats reveal Medicaid chief's spending on high-paid consultants | Trump calls question about why he 'lied' about COVID-19 a 'disgrace' MORE (Ky.) and Marco Rubio Marco Antonio RubioHillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Intelligence chief says Congress will get some in-person election security briefings Republican Senators raise concerns over Oracle-TikTok deal MORE (Fla.), reported more modest financial means. While Paul's wealth stood at about $455,000, Rubio was in the red with a negative net worth of roughly $190,000.

On the Democratic side, Sen. Mark Warner Mark Robert WarnerIntelligence chief says Congress will get some in-person election security briefings Overnight Defense: Trump hosts Israel, UAE, Bahrain for historic signing l Air Force reveals it secretly built and flew new fighter jet l Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' House approves bill to secure internet-connected federal devices against cyber threats MORE (Va.) stood out among possible 2016 hopefuls with a minimum net worth of $88.5 million, good enough for third place on The Hill's list.

Two other Democrats in the 2016 discussion, Sens. Elizabeth Warren Elizabeth WarrenNo new taxes for the ultra rich — fix bad tax policy instead Democrats back away from quick reversal of Trump tax cuts It's time for newspapers to stop endorsing presidential candidates MORE (Mass.) and Kirsten Gillibrand Kirsten GillibrandSuburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits The Hill's Campaign Report: 19 years since 9/11 | Dem rival to Marjorie Taylor Greene drops out | Collin Peterson faces fight of his career | Court delivers blow to ex-felon voting rights in Florida MORE (N.Y.), fell on opposite ends of the financial spectrum. While Warren reported a portfolio worth at least $3.9 million, Gillibrand was barely in the black with a net worth of $166,000.

The Hill's Wealthiest list bid farewell to some familiar faces this year.

John Kerry John Forbes KerryThe Memo: Warning signs flash for Trump on debates Divided country, divided church TV ads favored Biden 2-1 in past month MORE — a perennial contender for richest lawmaker thanks to his wife's ties to the Heinz ketchup fortune — left the Senate this year to serve as President Obama's secretary of State.

Ex-Sen. Herb Kohl (D-Wis.), owner of the NBA's Milwaukee Bucks and another regular on the list, decided to retire after last year's election.

And the late Sen. Frank Lautenberg (D-N.J.), who was the first full-time salesman for the payroll processing company Automatic Data Processing, died in 2013.

Taking their place are several lawmakers who are serving their first terms on Capitol Hill.

Among the new additions is Rep. Joseph Kennedy (D-Mass.), whose $15.2 million showing continues the tradition of having a wealthy member of the Kennedy clan in Congress.

Other first-timers include Rep. Suzan DelBene Suzan Kay DelBeneDemocrats say affordable housing would be a top priority in a Biden administration On The Money: McConnell not certain about fifth coronavirus package | States expected to roll out unemployment boost in late August | Navarro blasts 'stupid' Kodak execs On The Money: Economists flabbergasted after Congress leaves with no deal | Markets rise as the economy struggles | Retail sales slow in July MORE (D-Wash.), a former Microsoft executive with wealth of at least $23.9 million; Rep. Chris Collins (R-N.Y.), a former businessman with $22.3 million; and Rep. Steve Daines (R-Mont.), a former tech entrepreneur with at least $9.2 million.

Other lawmakers earned a spot on the list after their assets climbed skyward.

Rep. Jim Cooper (D-Tenn.) saw his share in Kentucky and Tennessee farmland and real estate spike, helping to give him a net worth of $8.2 million. Rep. John Fleming John Calvin FlemingTrump wants Congress to delay Census deadlines amid pandemic Meadows sets up coronavirus hotline for members of Congress The Hill's Morning Report - Iran strikes US bases in Iraq; Trump to speak today MORE's (R-La.) wealth was $10.7 million in 2012 after his holdings in franchise development and properties soared in value.

But it's Issa who stands as king of Capitol Hill, thanks in no small part to the removal of $100 million in liabilities from his balance sheet on his 2012 form.

Issa listed several investment funds among his assets, including some that are worth more than $50 million each. He also has properties valued in the millions of dollars.

Before coming to Congress, Issa was a successful chief executive who founded Directed Electronics and served as chairman of the Consumer Electronics Association.

The runner-up on the list, McCaul, owes much of his wealth to family trusts. His wife, Linda, is the daughter of Clear Channel Communications founder Lowry Mays.

To come up with its rankings, The Hill used financial disclosure forms covering the 2012 calendar year. The reports are not perfect because they provide value ranges instead of exact figures.

The Hill adds up the low figures in each value range for every asset and liability. Then, the sum of a lawmaker's liabilities is deducted from the sum of his or her assets to calculate a minimum net worth.

Some lawmakers provide lengthy bank statements or investment reports with their annual financial statements. The Hill uses exact figures when possible.

The methodology is designed to provide a conservative estimate of a lawmaker's worth, and it's likely that many lawmakers, such as Issa and McCaul, are wealthier than their reports indicate.

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— Meredith Bentsen, Amrita Khalid, Mike Lillis, Tianna Mañón, Talia Mindich, Alex Resnak and Katie Tank contributed to this report.