JOHN AND JUDY PHELPS of North Carolina are marching for a cause.

They were in Philly the last two days during a 300-mile trek from a firehouse near Sandy Hook Elementary School in Newtown, Conn., to Washington, D.C., where they hope to talk gun control with their state's senators, Richard Burr and Kay Hagan.

John Phelps said he founded a group called Gun Control Today and got the idea for the walk after last month's unsuccessful Senate vote on gun control left him in disbelief.

"I want to congratulate Kay Hagan on voting 'yes' on expanding background checks, but I also want to ask her why she voted 'no' on banning assault rifles," said Phelps, 64, a retired chemist.

On Dec. 15, Phelps picked up a newspaper and learned of the horrific events of the day before.

Twenty students and six adults were fatally shot at the Sandy Hook school. The news hit Phelps, a grandfather of four, particularly hard.

"I thought, 'That could have been my grandchildren,' " he said.

Having marched through New York City, Trenton and Philadelphia - where they were joined by daughter Erin Carmena - the couple headed off yesterday for Kennett Square.

"I have blisters on the soles of my feet," Phelps said as he rested his left leg on a table in a Center City hotel before departing. "I should get some stock in Advil."

Follow the couple's march on