In the year before the election, political action committees (PACs) of interest groups have contributed over $1 million to an incumbent Senator who had been facing a challenge from within his own party.

Sen. Michael Enzi, R-Wyo., reported raising $1,183,516 in the first three quarters of 2013, with $819,276 coming from PACs and other committees, and only $287,070 from individuals. (View Enzi’s financial profile.)

Since then, PACs that report monthly have reported giving Sen. Enzi’s campaign another $181,000 from 9/30. The figure will go higher as more reports are filed and Enzi’s campaign files their year-end report.

Fourth quarter PAC contributions include $10,000 from the International Council of Shopping Centers Inc. PAC; $10,000 from the Desert Caucus; $5,000 from the Real Estate Roundtable; $5,000 from the Wine and Spirits Wholesalers of America PAC; $5,000 from the Energy Transfer Employee Management Company PAC; $5,000 from the UBS Americas Inc. PAC; $5,000 from the National Beer Wholesalers Assn. PAC; $5,000 from the Employees of Northrop Grumman Corp. PAC; and $5,000 from the Marathon Petroleum Corporation Employees PAC; among others.

Wyoming’s Own, a super PAC supporting Sen. Enzi, registered in September and has not yet filed a disclosure report.

Liz Cheney, R-Wyo., who had been running against Enzi, announced on Monday that she would end her effort to seek the Wyoming Senate seat.

Cheney reported raising $1,027,569 in the first three quarters of 2013, with only $500 coming from PACs, and $993,226 coming from individuals, and $33,843 from the candidate. (View Cheney’s financial profile.) Late third quarter PAC money, not yet reported by the candidate, includes $2,600 given by one PAC.

Cowboy PAC, a super PAC supporting Cheney, held a $10,000-per-couple fundraising event in Washington, D.C. in early December. The PAC will issue their report by the end of January.