The GOP moves to make national security an issue in the elections.
Dem divisions over war could get worse.
Senator Chris Murphy will vote No on arming the Syrian rebels.
What happens when the war train leaves the station?
What their battle is really about, and why it matters.
Why the law is mostly fading as a political issue.
Many are likely to vote Yes on arming the Syrian rebels.
A new Karl Rove ad blitz tries to change the subject.