The California Association of Realtors announced a new TV, Web, radio and print ad campaign today that highlights the positive impact its 155,000 members have on the state's economy.

Two 30-second TV spots, featuring the "ripple" effect that the facilitation of home buying and selling has on the economy and families, will air on the ABC network in San Diego, Los Angeles and San Francisco from today through June 16. In addition, on April 17, a spot will air during the network's hit show "Modern Family" in the three markets.

A national multiple listing service run by the National Association of Realtors should be ready by late summer, the large trade association announced today.

NAR has been working for the last decade to put all of the nation's agent-represented homes for sale into one database, consolidating the 800-plus multiple listing services in the U.S. in the process.

"Everybody has been on board with the national MLS idea for a long time and we've been working on it for the last decade," the trade group said in a press release.