Former Tucson City Council Member Rodney Glassman is leading his three opponents with 15 percent voter support in the Arizona Democratic primary senate race, according to a new Rasmussen poll.

However, almost half of the voters surveyed remain undecided, meaning anybody could still prevail.

The other three candidates are close behind: ex-State Representative Cathy Eden with 11% support, followed by labor organizer Randy Parraz at 10% and investigative reporter John Dougherty at seven percent (7%).

Ten percent (10%) of likely primary voters favor some other candidate in the race, and 47% are undecided. Fifty percent (50%) or more don’t know enough about any of the primary hopefuls to express any kind of opinion about them, favorable or unfavorable.

These findings have changed little from a month ago, when Glassman and Eden were in a near tie with 12% and 11% of the vote respectively. Forty-six percent (46%) were undecided.

Earlier, Rasmussen reported on the Republican side that John McCain leads J.D. Hayworth by 20 points.

And now for our usual Rasmussen Reports disclaimer: The "Likely Voters" methodology has been criticized by other polling outfits.