As we continue to watch the Battle for the Senate and the midterm elections, is the momentum is starting to shift?  We know the main story line: Many of the most competitive seats are held by Democrats in states where President Obama lost in 2012. And now, with states like Colorado coming even more into play, are Republican odds on the rise? And if so, will it be enough for them to secure the net gain of six seats – the magic number they need to retake Senate control?To help us consider what’s possible: Tom Jensen, director of Public Policy Polling.