In Maine, the closely divided 2nd congressional district received campaign events in 2008 (whereas ME's 1st reliably Democratic district was ignored).  
In 2012, the whole state was ignored. 
77% of ME voters have supported a national popular vote for President
In 2008, the ME Senate passed the National Popular Vote bill

In Nebraska, the 2008 presidential campaigns did not pay the slightest attention to the people of NE's reliably Republican 1st and 3rd congressional districts because it was a foregone conclusion that McCain would win the most popular votes in both of those districts. The issues relevant to voters of the 2nd district (the Omaha area) mattered, while the (very different) issues relevant to the remaining (mostly rural) 2/3rds of the state were irrelevant. 
In 2012, the whole state was ignored. 
74% of NE voters have supported a national popular vote for President

The National Popular Vote bill is a way to make every person's vote equal and matter to their candidate