Washington CNN  — 

House Speaker John Boehner’s resignation is setting in motion an all-out scramble for the top leadership positions, and with it, a proxy fight for the future direction of the House GOP.

Republican lawmakers are maneuvering to put themselves – or their allies – in line for the top two spots in particular: speaker and majority leader, since Boehner’s surprise Friday announcement.

Current House Majority Leader Kevin McCarthy is the front-runner to move into the speaker’s office. Current GOP No. 3, Rep. Steve Scalise, is making a play for McCarthy’s majority leader spot, but faces a challenge from Rep. Tom Price, who is already lining up key endorsements.

That leaves a race for whip – the No. 3 position – up for grabs.

Here’s a look at who’s in who’s out in the race to run the House GOP.

Speaker

In: Rep. Kevin McCarthy, California

McCarthy, 50, is the favorite to win the spot, having moved quickly in Boehner’s wake to reach out to his colleagues and shore up support among both the moderate and more conservative arms of the party. It would be a fast ascent for the California Republican: He was first elected to Congress in 2006 and after two terms, in 2011, rose to the No. 3 spot in leadership. In August 2014, after former Virginia Rep. Eric Cantor was defeated in his primary race, McCarthy moved into the majority leader spot, which has given him the inside track on replacing Boehner.

McCarthy is positioning himself as a leader that can unite the party, from the conservative firebrands to the more moderate Republicans. He’ll need 218 of the 247 House Republicans to assure his spot as speaker, meaning he can only lose 29 votes from his colleagues.

In: Rep. Daniel Webster, Florida

Webster, 66, is the only other declared candidate challenging McCarthy. The Florida Republican was elected in the 2010 wave election. He has run for speaker before – challenging Boehner in January. Though Webster came in second to Boehner, he only got 12 votes from his colleagues. (After challenging Boehner, Webster was removed from his assignment on the influential House Rules Committee.)

Out: Rep. Paul Ryan, Wisconsin

Despite being popular among his colleagues and a prominent Republican voice, the former GOP vice presidential candidate is skipping a run for leadership. Ryan, chairman of the powerful House Ways and Means Committee, put out a statement backing McCarthy, calling him an “effective leader.”

Out: Rep. Jeb Hensarling, Texas

The House Financial Services Committee chairman quickly ruled out a bid for any leadership positions, putting out a statement backing Rep. Tom Price for majority leader, as well.

Majority leader

In: Rep. Steve Scalise, Louisiana

Scalise, 49, is the current House majority whip, a position he’s held since 2014 after Cantor’s departure resulted in McCarthy’s moving up. Scalise won the three-way race by campaigning to represent conservatives. Scalise was first elected to Congress in a special election in 2008 and served as the chairman of the conservative Republican Study Committee before winning the No. 3 leadership spot.

In: Rep. Tom Price, Georgia

Price, 60, chairs the powerful House Budget Committee and has moved quickly to build support to challenge Scalise for the majority leader position. Elected in 2004, Price has earned a reputation as a fiscal conservative. He has already locked up important endorsements from Ryan and Hensarling for his bid to be majority leader, a move that edged out one of his potential challengers, Rep. Cathy McMorris Rodgers, the current No. 4 in House leadership, who had been considering a run.

Out: Rep. Cathy McMorris Rodgers, Washington

The House Republican Conference chair, McMorris Rodgers had begun making calls to mount a bid for majority leader, a move that would have leapfrogged her into the No. 2 spot. But she never announced a run, and on Monday night said she would remain in her current leadership position amid the crowded field.

Out: Rep. Pete Sessions, Texas

Sessions opted to run for whip over majority leader, he told CNN on Tuesday. He first announced the move in a letter to colleagues on Tuesday, according to the Dallas Morning News.

Out: Rep. Trey Gowdy, South Carolina

Prominent lawmakers including Reps. Jason Chaffetz and Mia Love, had called for the firebrand Gowdy to run for Majority Leader. Gowdy has gained notoriety in the party as the chairman of the House Select Committee on Benghazi, which has been investigating former Secretary of State Hillary Clinton.

But Gowdy says he’s not running.

“I’ve never run for any leadership position and I’m not going to start now,” he said Tuesday.

Whip

In: Rep. Pete Sessions, Texas

Sessions, 60, has been in office longer than many of the lawmakers jockeying for a spot on leadership. The Texas Republican was first elected in 1996 and is the chairman of the powerful House Rules Committee. Sessions sent a letter to colleagues making his pitch Tuesday, saying he would set the party on “the right path to fight for our conservative principles” and citing his leadership of the National Republican Congressional Committee leading up the wave election in 2010, according to a copy obtained by the Dallas Morning News

In: Rep. Dennis Ross, Florida

Ross, 55, was first elected to the House in 2010. He announced his whip run in a statement on Monday, saying he is looking to “advance our conservative cause in a positive way by passing legislation that forces the President to either sign bills into law or explain to the American people why he vetoed them.” He has been ranked among the 15 most conservative lawmakers by National Journal.

In: Rep. Markwayne Mullin, Oklahoma

Mullin, 38, is one of the younger candidates for leadership. He was first elected to Congress in 2012. He has been a strong advocate of defunding Planned Parenthood.

In: Rep. Patrick McHenry, North Carolina

McHenry, 39, was first elected to Congress in 2004. He announced he was running on Tuesday in an email to colleagues in which he called for a “culture change” in the party. He called for “a new culture based on trust, consistency, communication, and collaboration,” according to The Charlotte Observer.

Wildcard: Rep. Peter Roskam, Illinois

Roskam has so far shied away from running for any leadership posts, but he’s maneuvered for a role in picking the next leader. He successfully pushed for the party to hold a private meeting to debate its future before holding leadership elections on Tuesday evening. An aide told CNN on Monday that Roskam is currently not making calls for a leadership position. The former deputy whip lost his bid to move into whip to Scalise.

CNN’s Deirdre Walsh contributed to this report.