As has been said by many political analysts: You’re right - you will not sway the hard-core koolaid drinkers.
Your job, as a national candidate, is to sway the 20 to 25% “in the middle” voters who:
1. Don’t make up their minds until very late in the season,
2. Usually choose economic concerns as their litmus test,
3. Are fickle.
4. If left with no viable choices, might not even turn out.
For those people, the economic message is a strong one. Especially for parents with unemployed 20-somethings sleeping on their couches for several years now...