Three days before the December massacre in Newtown, Conn., a 22-year-old gunman named Jacob Tyler Roberts opened fire at the Clackamas Town Center, a suburban shopping mall in Portland, Ore. He killed two people before killing himself, though it could have been much worse. His stolen semiautomatic AR-15 rifle jammed early in his shooting spree.

Ginny Burdick, 65, a veteran state legislator, is probably the fiercest gun control advocate in the Oregon State Senate. In recent years, however, as the chairwoman of the Senate Finance and Revenue Committee, she had focused most of her attention on tax policy and budgetary issues. Then came the horrors of Clackamas and Newtown.

“I said to my fellow legislators, ‘Sorry folks, I have to put this back on the front burner,’ ” she told me the other day. She had already sponsored a bill to limit magazines to 10 rounds or less. She immediately sponsored several other bills, including one requiring background checks for private gun sales. (Thanks largely to Burdick, Oregon was one of the few states that had already closed the “gun-show loophole.”) Another would make it illegal for people with concealed carry licenses to take their guns into an Oregon school.

“We were in the middle of a special session on a very important tax bill,” she said. “I was right on the middle of it. I said, ‘We’re going back to guns.’ ”