The race for Massachusetts' sixth congressional district has gone national.
Republican challenger Richard Tisei is challenging incumbent Democrat John Tierney once again. In 2012, Tisei lost to Tierney by a very narrow margin.
The Massachusetts GOP has lost the last 92 U.S. House elections. This election could be their best chance.
But even before Tierney can face Tisei in the general election, he is facing a surprising primary challenge.
WBUR's Asma Khalid has been on the campaign trail with the candidates, and discusses why this race is one to watch.
This segment aired on April 23, 2014.