WRAPUP 8-Healthcare bill poised to pass U.S. Senate test

(For full coverage of U.S. healthcare reform, click [ID:nN20512341])

* Healthcare overhaul poised to pass first Senate test

* Democrats need 60 votes to move to debate on bill

* Final two wavering Democrats to back the motion (Adds McConnell, Landrieu quotes, details)

By John Whitesides

WASHINGTON, Nov 21 (Reuters) - A broad healthcare overhaul was poised to clear its first U.S. Senate hurdle on Saturday as the last wavering senators said they would vote to begin debate on the legislation, giving Democrats the 60 votes they need.

Democrats Blanche Lincoln and Mary Landrieu ended days of uncertainty and said they would support a procedural motion on Saturday to open debate to reform the $2.5 trillion healthcare system -- the Senate bill's first crucial test vote.

The healthcare overhaul, President Barack Obama's top domestic priority, would expand coverage to millions of uninsured and bar insurance practices like denying coverage to those with pre-existing conditions.

The stakes are high for Obama in the healthcare debate, with his political standing and legislative agenda on the line less than a year into his first term.