UPDATE, 3:45 PM: Brownstein is even more hard working than I thought. ABC’s announcement apparently reminded CNN that it also signed the analyst last week to help with election coverage. CNN disclosed the news today in a blog post. Brownstein says that CNN “never loses sight of the fact that campaigns are not a form of entertainment — they are the way we set our direction and settle our differences as a society.”

PREVIOUS, 11:42 AM: Talk about hard working. Ron Brownstein will continue to serve as the National Journal’s editorial director and write his column for the Washington-based magazine and The Los Angeles Times while he contributes 2012 election analysis to ABC News. Here’s the note ABC News president Ben Sherwood sent to staff:

Please join me in welcoming National Journal Editorial Director Ron Brownstein to the ABC News political team. As one of the country’s preeminent political journalists, Ron will provide in-depth analysis and perspective across all ABC News platforms on the issues and candidates driving the 2012 election.

Many of you remember Ron’s incisive contributions to our Emmy-nominated 2010 election night coverage and his penetrating work as a columnist for the National Journal and Los Angeles Times.

Ron is a two-time finalist for the Pulitzer Prize for his coverage of presidential campaigns and is the author or editor of six books on politics and policy. As National Journal Group’s Editorial Director, Ron is in charge of long-term editorial strategy and contributes regular features on policy and politics to National Journal. In addition to his appearances on ABC News, he will continue to write his weekly column published jointly in National Journal and the Los Angeles Times.

As we strive to give our audience a deeper understanding of 2012 election, Ron’s many talents and abilities will give ABC News a decisive advantage.