The jockeying continues in the US Senate races, and the challenge for Democrats seems to keep getting harder.With any thoughts of recapturing the House a longshot at best, focus remains on the Senate. Will the Democrats hang on? Or will full Legislative control shift to the Republicans. And as Midterms 2014 only grow more intense, how does the political uncertainly affect our policy chances of getting anything done?The best way to understand the big picture – look at the key races one by one. And that’s exactly what Jennifer Duffy does. She’s Senior Editor for The Cook Political Report.