… House races, in this modern political age, are almost entirely dictated by the national landscape. It’s virtually impossible for any House candidate to stand out (or above) the national environment. Senate races — featuring better-known candidates and lots more money — can buck national trends (although they don’t always). Senate races have become, in effect, mini presidential races and, like presidentials, can create their own gravitational pull. CONT.
Chris Cillizza, Washington Post