CNN

WASHINGTON (CNN) - The Service Employees International Union — one of the largest and most influential labor organizations allied with the Democratic party — will be supporting Hillary Clinton, John Edwards or Barack Obama, the group announced Wednesday.

The SEIU executive board plans to meet with strategists from the Clinton, Edwards and Obama campaigns on Monday in Chicago. SEIU President Andy Stern said the union is satisfied with all of their health care reform plans, and is now in the process of deciding who is most capable of winning next November.

"We think these three candidates demonstrated they clearly stand on the [right side of the] issues that are important to us," Stern said. "And now [we] want to dig down on who is in the best position to win."

An SEIU spokeswoman said the union has not decided when it will make its final decision. The union has about 1.9 million members nationwide.

The SEIU endorsed current DNC Chairman Howard Dean's presidential bid in 2003.

– CNN Associate Producer Lauren Kornreich