In case you want a different opinion other than the Rev, here is Michigans largest daily
Thousands protest in Lansing against governor's policies | Detroit Free Press | freep.com
they said there were more than 5 thousand in attendance with another listing it as more than 7,000.
One different thing about this rally was that it started late morning and lasted until well after 6 PM. Most rallies here are a few hours and by 2 PM everyone has gone home. Because of that, they had two shifts of people who came in - some leaving for a 3PM job start and others arriving after a 3 PM job ending shift. As a result, there were between 4,500 and 5,000 people on site at any given time but the numbers of actual participants was much higher than that.