The event was named "Go the Distance" and the bill's author, Assemblyman Nathan Fletcher told 10 News there is a long, tough fight ahead.

"We cleared our first hurdle which was the assembly public safety committee this week. But it's the first step in a long process," he said.

The bill will head to the appropriations committee which will have to figure out how to pay for it.

"It'll be analyzed for cost, we'll determine what it is and then we'll start looking for ideas for reform to try and offset the cost," said Fletcher. "I believe this is the most important thing government does; protection of our children, but we need to find the savings in order to pay for it."

One of the hundreds in attendance at Lake Poway Park was Scott Shoemaker. He and his family live just a few doors away from the Kings and his daughter used to run on the cross country team with Chelsea.

He said events like today's rally are what keep the Kings going.

"I think they feed off a lot of the community's support in a way that's really positive," he said.

Also in the crowd was Stephanie Dorian, Chelsea's cousin. "

The community never ceases to amaze us with their love and support and generosity of spirit and heart and compassion. We're just continually blown away," said Dorian.

Like Assemblyman Fletcher, Dorian said the Kings aren't under any illusions about the tough legislative fight that lies ahead.

"This event tonight called 'go the distance' is really representing that journey. It's not going to be easy but we're working with a tremendous team," she said.

Brent and Kelly King briefly addressed the crowd. Brent King urged everyone to write their state representatives to urge them to support the law. Kelly King choked back tears as she thanked everyone for their love and support.