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Pollsters don't expect a sea change in either branch of Congress this year. According to the Real Clear Politics website, which compiles polling data on every race, Democrats have 46 safe or non-contested Senate seats heading into the election, compared with the Republicans' 43, with 11 races classified as "toss ups." RCP's House polling discounts virtually any possibility that Democrats could take over there. The site's average "generic ballot" shows that Republicans have half a percentage-point lead among voters in general, further suggesting that there will be no major shift in the balance of power on Capitol Hill. But several key committee leadership posts are changing hands, influential leaders are exiting Washington, and a new crop of national security lawmakers is looking to...