Ron Elving, senior Washington editor, NPR
Vin Weber, partner, Mercury Public Affairs
Anna Greenberg, senior vice president, Greenberg, Quinlan, Rosner Research
With the Republican primary season completed, the presidential campaigns are buckling down for the months ahead. NPR's Ron Elving and political strategists Vin Weber and Anna Greenberg discuss the presidential race, key battleground states and what it will take for candidates Romney or Obama to win in November.