In our inaugural Senate race ratings two weeks ago, we found that Republicans were slight favorites to hold on to their majority in a tough year. Now, with Hillary Clinton gaining in the presidential race, it's looking more like Democrats have the slightest of edges. In our latest Senate race ratings, we're making a couple of big changes in Democrats' favor and moving one lower-tier race toward the GOP. Democrats have to win only half — three of the six races — to bring the Senate to 50-50. Below, we recap the changes:MISSOURI — “lean Republican” to “toss-up”This is the most surprising toss-up on our map.

Source: Washington Post October 05, 2016 17:28 UTC