After telling the Village Voice he would be an "excellent Speaker" last month, controversial City Councilmember Charles Barron is expected to announce that he will challenge City Council Speaker Christine Quinn for leadership tomorrow. He tells the Daily News that he knows he's a "long-shot" but adds, "This is going to be done from the ground up. I think the speaker should be a facilitator, not a dictator." Barron has been in the news this week for his intense-for-a-groundbreaking ceremony argument with a CUNY trustee, whom he called a "sickening racist" and whom he wants removed.