According to nationwide opinion polls in early 2015, Clinton was the front-runner for the 2016 Democratic presidential nomination. She did face other several primary election challengers. A Franklin Pierce University/Boston Herald poll in mid-August 2015 showed Senator Bernie Sanders with a 44-37 lead over Clinton in the first-in-the-nation primary state of New Hampshire. And, in August 2015, Vice President Joe Biden was reported to be seriously considering a possible challenge to Clinton.