The Newtown, Conn., shooting has been the rallying cry for new gun control laws in states like Colorado, where the statehouse narrowly passed four bills.

One measure limits the size of ammunition magazines to 15 rounds for firearms and eight for shotguns.

Another bill requires background checks on all gun purchases, including those purchased online.

The fourth measure bans concealed firearms at colleges and stadiums.

Statehouse lawmakers began debating Friday after Vice President Joe Biden called on Democrats to back the measures.

One lawmaker said she didn't appreciate "East Coast politicians" influencing Colorado legislators.