Florida Senate candidate Jeff Greene (D) has taken the unusual step of attacking primary rival Rep. Kendrick Meek (D-Fla.) in the D.C. media market.

Greene, a self-funding upstart, may be trying to prejudice the Democrats' Washington leadership against Meek.

"Tell Congress to investigate Kendrick Meek's corruption," the announcer says.

Meek has the backing of the Democratic Senatorial Campaign Committee and is expected to be the party's nominee in the three-way Senate race against Republican Marco Rubio and Gov. Charlie Crist, who's running as an independent.

The ad is running on cable networks CNN, MSNBC and Fox but won't be seen in Florida, according to a Greene spokesman. The purpose is to put pressure on the House Ethics Committee to launch an investigation into Meek's dealings with campaign contributor Dennis Stackhouse.

A Florida-based strategists noted the ad is only a $16,000 buy and will rarely been seen by Washington-area viewers.

The firm Trippi & Associates is producing Greene's TV ads.

Meek's campaign dismissed the move.

"It's no surprise that a California Republican would try to mislead DC voters about a Democratic primary in Florida using the ill-gotten gains he made destroying the middle class," Meek spokesman Adam Sharon said in a statement.

—Updated at 5:08 p.m.