SPRINGFIELD - A plan to help thrust U.S. Sen. Barack Obama into the White House in 2008 by moving Illinois' presidential primary to an earlier date appears destined to become law.

Specifically, the measure would shift Illinois' presidential primary from the third Tuesday in March to the first Tuesday in February in even-numbered years. In practice, legislators hope it boosts the Chicago Democrat's chances by giving him an early victory on his way toward the Democratic nomination.

The measure, which the state Senate approved Tuesday on a 48-10 vote, now heads to the desk of Gov. Rod Blagojevich, who intends to sign the legislation into law.

"We support the bill," spokeswoman Rebecca Rausch said.

Other supporters, including Senate President Emil Jones, D-Chicago, said the change will not only help Obama's chances, but it will give Illinois more influence in the outcome of the primary season.

"We want to be a player in this race," said state Sen. Mike Jacobs, D-East Moline.

But Republicans argue the move will stretch out the campaign season.

"This will make campaigns more expensive," said state Sen. Dale Righter, R-Mattoon.

Further, critics of the move have said Obama will realize no distinct advantage as at least 21 other states will hold their primaries on the same day, effectively diluting the impact of a win.

Others worry the change will result in voters getting nasty campaign mailers at the same time they are receiving Christmas cards.

But not all Republicans opposed the move.

"I think that Illinois has taken a back seat over the years," said Senate Minority Leader Frank Watson, R-Greenville.

Officials at the Illinois State Board of Elections have said implementation of an earlier primary will mean big changes, including shifts in candidate filing and certification dates.

Election officials said summer vacations have been put on hold to make sure preparatory work for the primary change is completed on time.

The legislation is House Bill 426.