The National Republican Congressional Committee (NRCC) has expanded its list of vulnerable members who it will focus its incumbent retention program on.

The NRCC added 15 members to its Patriot program Wednesday, and they join the 10 members who were originally put on the list.

The new members are Reps. Mike Rogers (Ala.), Mary Bono Mack (Calif.), Bill Posey (Fla.), Tom Rooney (Fla.), Mario Diaz-Balart (Fla.), Lynn Jenkins (Kan.), John FlemingJohn Calvin FlemingCoast Guard suspends search for missing Ohio plane Freedom Caucus member to bring up bill on impeaching IRS chief GOP seeks to make it 52 MORE (La.), Bill Cassidy (La.), Michele BachmannMichele Marie BachmannBachmann won't run for Franken's Senate seat because she did not hear a 'call from God' Billboard from ‘God’ tells Michele Bachmann not to run for Senate Pawlenty opts out of Senate run in Minnesota MORE (Minn.), Blaine Luetkemeyer (Mo.), Lee Terry (Neb.), Scott GarrettErnest (Scott) Scott GarrettFive things lawmakers want attached to the trillion funding bill Bipartisan group of House lawmakers urge action on Export-Import Bank nominees Manufacturers press Senate to approve Ex-Im board members MORE (N.J.), Dean HellerDean Arthur HellerRepublican drops Senate primary challenge to Heller after Trump's urging Three states where Dems can pick up Senate seats GOP senator: Justice Kennedy is going to retire this summer MORE (Nev.), Charlie Dent (Pa.) and Cynthia LummisCynthia Marie LummisFemale lawmakers flee House for higher office, retirement Despite a battle won, 'War on Coal' far from over Dems on offense in gubernatorial races MORE (Wyo.).

Posey, Rooney, Jenkins, Fleming, Cassidy, Luetkemeyer and Lummis are all freshman. The others were targeted by Democrats in 2008, with mixed results.

There are a few curious absences from the list so far.

One is Rep. Mike Castle (R-Del.). Several of the new Patriots had opponents raise big money against them in the second quarter, and Castle did too. Take it as a sign that the party believes there's little chance he will be seeking reelection.

Another is Rep. Bill Young (R-Fla.). Young comes from a tough district and has a solid opponent, yet seemingly less vulnerable members with no opponents are still being added to the list before him. Could be a sign of retirement.