Political battleground states are usually called this secondary color
They're called the battlegrounds, and political scientists in each of five .... a 
battleground state  or a swing state  first of all, that state usually... [DOC] [TLE] Swing States: States That Can Decide the 2016 Presidential Election [PAR] Dec 27, 2015 ... Called swing states, these holdouts cannot be relied upon to vote ... the Cook 
Political Report and the Rothenberg & Gonzales Political Report.