Vice President Biden was deploying a major strategy of the Obama campaign when he turned directly to the camera and said, “Look, these guys haven’t been big on Medicare from the beginning. … Look, folks, use your common sense on this. Who do you trust on this?”

Polls indicate that concern over Romney and Ryan’s approach to Medicare has boosted Obama’s support among seniors who might otherwise be reliable voters for Romney. The issue has not been polled since last week's presidential debate.