Yep, its amusing Stein got higher % in Arkansas than Washington or something. To be fair Greens nationally are probably "strongest" in CA (followed by ME, AR, TX,WV, MA). Vermont has the prog party as a competent, left of dems, 3rd party.. so probably fills up any room for GP. Libertarians seem strongest out west (MT, AK, CO,AZ) but weakest in the south, which I find suprising.. states like AL should be receptive.
Third parties do well where the local third party has managed to build up a fairly competent party which manages to run candidates in every election. After all, the Green Party does well in Arkansas and West Virginia; which definitely aren't the type of places where you'd expect a party with a reputation as tree-lugging hippies to do well; in contrast, Vermont has no Green Party and the Greens seem incompetent/dormant/useless in CA, OR, AK etc.
There's also because Indiana Republicans tend to nominate awful candidates (Misogynistic Creep Dick Mourdock, Washington Lobbyist Dan Coats)