In the Senate, candidates who are Mormon (CJCLDS members) currently hold 7 of the 100 seats (7%).
(Mike Crapo (ID), Jeff Flake (AZ), Orrin Hatch (UT), Dean Heller (NV), Mike Lee (UT), Harry Reid (UT), and Tom Udall (NM).)
Mormons as a percentage of the general population are about 6,398,889 out of 317,831,000, so about 2%. In the Senate, then, they are out-performing their general population numbers by about 350%.
The current Senate Majority Leader (soon to be Minority Leader) is a Mormon, and the expected next President Pro Tempore (third in line of succession to the Presidency, after the Vice-President and Speaker of the House) is a Mormon (Orrin Hatch, the longest serving Republican member of the Senate).
Also, the number of Mormons in the Senate from outside of Utah, currently at 5, is greater than the number of Mormons in the Senate from outside of Utah in total before now (there have been 4 before the current Senators).
Congress Infinity is here.