MANCHESTER, New Hampshire — A new high-powered ad spot—and hefty buy behind it—aims to finish off incumbent Democratic Sen. Jeanne Shaheen (D-NH) and help former Sen. Scott Brown across the finish line. The ad comes from Ending Spending Action Fund, which is spending approximately $1.25 million in the final days pushing this message via television, radio, Internet, forthcoming print advertisements, and direct mail. That’s in addition to an existing $601,000 buy the group is already running in local television markets, meaning the group is up with more than $1.85 million backing Brown in the final week. http://www.youtube.com/watch?v=SaAteJWDNI4 The television ad,...