The proposal faces difficult political hurdles not directly addressed by the report.

A difficult hurdle, she said, "is getting people to agree and believe they will get a return on their initial investment."

This change of emphasis from cash to produce is probably the most difficult mental hurdle.

For many people with diabetes, this is one of the most difficult hurdles.

Even opponents acknowledged that the measure may have overcome its most difficult hurdle today.

This has left Oracle with a hugely difficult legal hurdle.

"Heirs are much more willing to compromise when they have two difficult hurdles to jump."

Demonstrating that the federal interest was not "vindicated" at the trial last month is another difficult hurdle.

We want new categories to be admitted to allow people over this very difficult hurdle.

"That will be a difficult hurdle for us," he said.