Midterm elections: Blue wave or red undertow?

Summary

Midterm elections are almost always bad for the president’s party. Sometimes they are very bad for the president’s party. And every so often they are historically bad. The first outcome seems guaranteed on Tuesday. Republicans are increasingly wary of the second. And more Democrats are daring to dream of the third. CNN's Audie Cornish and CNN senior political analyst Ron Brownstein discuss which eventuality is most likely based on the political climate heading into midterm elections. Also, Audie speaks with Cook Political Report's Jessica Taylor about seven critical toss-up Senate races and…

Description from CNN.