McCain offers free ride to supporters

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(CNN)—John McCain is offering a free ride on the Straight Talk Express to supporters who make a contribution to his campaign over the next week.

In a fundraising email sent to the presumptive Republican nominee’s supporters, McCain calls the Straight Talk Express a symbol of his campaign’s “openness, honesty and access—true democracy at work.”

“I believe voters deserve a close, unfiltered examination of our presidential candidates,” McCain writes, inviting supporters for a “day of conversation and campaigning.”

Calling upon the success of the last bus ride contest, the Arizona senator explains the invitation is a “token” of his appreciation for each individual donation.

Every donation, no matter the size, made before next Monday at midnight will be entered into the drawing for a day with McCain on board his bus.

In a possible dig at rival Barack Obama, McCain adds a post-scriptum:

“P.S. I've never been afraid to do things a little differently on the campaign trail,” McCain writes. “I've never been afraid to hold town hall forums, engaging Americans in a discussion on the issues.”

Watch: McCain push for town halls with Obama

Obama declined McCain’s invitation earlier this month to appear with the Arizona senator in a series of town halls.