An EZ Pass covers most states east of the Mississippi, at least the northeast states. Illinois has an IPass which works in EZ Pass states and Illinois tollroads will accept EZ Pass. The last time I needed to use my IPass across state lines the only road it did not cover was the Ohio Turnpike.
Thanks very much for that information and I guess the answer is no, there is not one pass that does the entire country. However, based on what you are saying, between EZ Pass and IPass they at least cover quite a few of them.