Rep. Kathy Castor: Romney's policies are a 'threat to the middle class'

A new CNN poll shows that Paul Ryan's addition to Romney's ticket has turned his home state of Wisconsin into a battleground state.

With 49% of registered voters saying they back President Obama and 45% supporting Romney, the overall numbers haven't changed much, but it's the very positive polling of Ryan that has spurred CNN to change the state from "lean Obama" to true "toss up" on its electoral map.

Democratic Florida Congresswoman Kathy Castor responds to the new polling and weighs in on the debate about the candidates' Medicare plans on Starting Point today.