Shays will likely face an uphill battle against former Worldwide Wrestling Entertainment CEO Linda McMahon in the Republican primary. McMahon spent $50 million of her own money on her 2010 Senate bid, but lost to now-Sen. Richard Blumenthal (D-Conn.).
Rep. Christopher Murphy, former Secretary of State Susan Bysiewicz and state Rep. William Tong are running for the Democratic nod.
Vice President Joe Biden waits to conduct a mock swearing-in ceremony with Sen. Brian Schatz, D-Hawaii, in the Capitol's Old Senate Chamber, December 2, 2014. Schatz was sworn in to serve the remainder of his term since he was appointed to the seat after Sen. Daniel Inouye, D-Hawaii, passed away.