Until he announced his immigration policy last week, Obama had the support of most Hispanic voters - but not the enthusiasm they had shown for him in 2008. That may be changing in part because of the decision not to deport young immigrants whose undocumented parents brought them here as children.
Mara LiassonRomney still enjoys the Republicans' traditional advantage among voters who are veterans, but the Obama campaign is confident it can chip away at that.
Mara LiassonThe winner's margin of victory also matters. If it's a squeaker, that will make the lessons learned for both parties much murkier.
Mara Liasson