Sen. Barack Obama has picked up the endorsement of superdelegate Roy Romer, a former Colorado governor who later served as superintendent of Los Angeles public schools.

Romer was the third superdelegate to throw his support to the Democratic frontrunner on Tuesday, after New Orleans Mayor Ray Nagin and Indiana congressman Joe Donnelly.

Romer says it's important for the presidential candidates to know where the superdelegates stand so the party can decided how to handle convention delegates from Michigan and Florida. Both states had their delegates stripped from them for violating party rules.

Romer says Obama has demonstrated leadership qualities with his coolness under fire.