WRAPUP 4-Clinton says "we cannot win" Iraq war

(Adds Florida Democrats reject revote)

By Jeff Mason

WASHINGTON, March 17 (Reuters) - Democrat Hillary Clinton charged on Monday the Iraq war may end up costing Americans $1 trillion and further strain the economy, as she made her case for a prompt U.S. troop pullout from a war "we cannot win."

This week marks the fifth anniversary of the U.S. invasion of Iraq, but voters now say the economy is their top issue in the campaign for the November presidential election.

Clinton, the former first lady who is trying to convince voters she has foreign policy gravitas, criticized both her rival for the Democratic presidential nomination, Illinois Sen. Barack Obama, and the Republicans' choice, Arizona Sen. John McCain.

She said the war has sapped U.S. military and economic strength, damaged U.S. national security, taken the lives of nearly 4,000 Americans and left thousands wounded.

"Our economic security is at stake," she said. "Taking into consideration the long-term costs of replacing equipment and providing medical care for troops and survivors' benefits for their families, the war in Iraq could ultimately cost well over $1 trillion."

It has already cost $500 billion.

Clinton said that while Obama insists he will withdraw U.S. troops in Iraq within 16 months of taking office, his former foreign policy adviser, Samantha Power, had said he might not follow through on the pledge.