A November 10 blog post at this site said that 25 minor party and independent candidates had been elected to state legislatures this month. Checking records of past elections reveals that this is the highest such number since 1942, when there were 31 such candidates elected. In 1944, there were 22 such candidates elected, and at no time since 1944 (until 2012) had there been any election with more than 17.
None of the independent and minor party candidates who were elected in 2012 were elected from states with a top-two primary system.