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.
Rep. Eric Swalwell, D-Calif., walks on Broadway after a Future Forum with young entrepreneurs in the Flatiron District of New York City, April 16, 2015. Reps. Steve Israel, D-N.Y., Seth Moulton, D-Mass., and Grace Meng, D-N.Y., also attended.