An intermission from the presidential horse race
For all the problems with US presidential elections, US congressional elections are arguably worse. The US president is at least usually in line with the popular vote; the US congress never is.
The two chambers of congress, the House of Representatives and the Senate, suffer from opposite problems. The House of Representatives has one member elected by each district, but the district lines are redrawn every ten years by politicians. Thus politicians can control their own reelection by the process called gerrymandering.
The Senate, on the other hand, never redraws its district lines. Instead, each state elects two senators. The state lines are the result of gerrymandering from a long time ago, but at least aren’t under the power of current politicians. Unfortunately, that means that the Senate is never proportional to the population sizes of the states, and heavily favors rural regions.
Although the Senate is blatantly unrepresentative of the US, the House arguably has it worse. Not to put too fine a point on it, but you can tell by how Republican the House is. Although Hillary is winning the popular vote and Democrats are likely to win Senate majority, the House will comfortably remain under Republican control.