"We came here today to ask the Senate to vote, " said Erica Lafferty, daughter of Dawn Hochsprung, the principal of Sandy Hook Elementary School, who died in the attack.

WSJ: Gun Measure Clears Senate Hurdle

Erica Lafferty, daughter of Dawn Hochsprung, the principal of Sandy Hook Elementary School, who died in the Newtown attack, said in an interview that she felt "overwhelming disappointment" with lawmakers and planned to continue her appeals.

WSJ: Background-Check Gun Measure Fails in the Senate