States Senate since 2007. During this current stretch, their operating majority has ranged from as small as a 51-49 edge, to a 60-40 veto- proof majority.
With the election of New Jersey’s Corey Booker to the upper chamber in October, the Democratic advantage now sits at 55-45; if the GOP wants to oust Harry Reid as majority leader, they’ll need to net six seats in the 2014 midterm elections.
On paper, this is an attainable goal. Democrats are facing a much more challenging map to defend, and nearly every single one of the Republican-held seats up for grabs is considered to be safe.