Inside the Forecast: What the GOP's streak of special election wins mean for November

Which party has the momentum headed into the homestretch of the midterms? Just look at some of the special elections held over the past few months.

After a long streak of major victories by Republicans, including flipping a South Texas House seat in June, Democrats have overperformed in a handful of recent races, including two congressional elections in Minnesota and Nebraska, in addition to the all-party primaries earlier this month in Washington State.

On this week's episode of "Inside the Forecast," Steve Shepard looks at the recent history for clues about November and previous the next big race: a special election for Congress next week in upstate New York that both parties are actively contesting.