Midterm elections preview: How might this year's vote change Washington?

Every four years, we get to choose our own president. But every two years, we have other elections, where we choose all 435 members of the House of Representatives, and a third of our Senators, and a whole lot of governors.
This is a midterm elections year, our chance to steer the direction of the country.
"These are historically viewed as referenda on the job performance of a president," said New Yorker politics columnist Susan Glasser . She believes Tuesday's elections will be historic in a long list of ways.
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