Senate Democratic leaders abruptly switched course in the Iraq war debate today, shelving a complicated non-binding resolution that has run into procedural hurdles, in favor of a House version that simply states Congress's objections to President Bush's troop escalation plan.

Majority Leader Harry Reid (D-Nev.) this afternoon announced that the Senate would take a rare Saturday vote on whether to consider the House resolution, which is expected to pass that chamber Friday, with some Republican support.

If the Saturday vote succeeds, Reid said he may cancel the upcoming week-long recess, scrambling campaign plans for at least six presidential candidates.

The House resolution expresses support for U.S. troops fighting in Iraq, but objects to Bush's plan to increase combat forces by 21,500.

"We are determined to give our troops and the American people the debate they deserve," Reid said.

In particular, Democrats are calling the bluff of a group of Republican senators who oppose the escalation, but who joined with their GOP leadership to block the earlier Democratic-led resolution from coming to a vote, in an effort to force Democrats to allow a pro-administration measure to be offered.