Coronarch,
Washington has no training requirement, and we have reciprocity with Ohio. There's nothing stopping Ohio from signing agreements with Pennsylvania or Indiana. Indiana might refuse because I've never heard of Indiana actually signing an agreement.
There are five "shall-issue" states that do not have an actual recognition or reciprocity statute: Oregon, Nevada, New Mexico, Connecticut, and Rhode Island (yes, Rhode Island is shall issue, the SCRI ruled so, it's just a matter of getting them to follow the law). Rhode Island and Connecticut are unlikely to get permit reciprocity/recognition going within the next two years, but Nevada, New Mexico, and Oregon are strong possibilities. (Though, you can get non-res permits from RI and CT).
There are also a few states that have really piss poor reciprocity laws: Maine (they refuse to sign agreements), South Carolina (SLED interprets the law crappily, I've been told that GOSC and GRSC are going to team up and get universal recognition as the next time after OGAM repealed), Minnesota (DPS misinterpreting the law).
Get those states on the ball, and we'll have much more in the way of national reciprocity.