I am guessing that this is part of the whole "I am greener than the giant on the frozen vegetable packages" McCain campaign pitch for those independent voters in the suburbs.

From a campaign email:

Team McCain,

This week our campaign is promoting John McCain's long-term commitment to providing market-based solutions to climate change and highlighting ways we can all protect our environment. We're also taking this week to launch a new section of our store - complete with eco-friendly items.

In our new store section, we're proud to offer eco-friendly t-shirts and polo shirts made from biodegradable fabric, as well as organic cotton hats and shopping bags. You can also buy travel mugs and notebooks made from recycled materials. Please show your support for John McCain by purchasing these items (or any other store item) by following this link...

.

This all makes sense to me. Because when I think organic cotton hats, I think John McCain.