A simple google search turned up this :
Unlike Congress and the legislatures of most other states, each chamber of the Illinois Legislature requires a “constitutional majority” to pass a bill. The state Senate has 59 members, so it takes 30 affirmative votes. This makes a “present” vote the same as a no. If a bill receives 29 votes, but the rest of the senators vote “present,” it fails.
In the Illinois Senate, there can be strategic reasons for voting “present” rather than simply no. A member might approve the intent of legislation, but not its scope or the way it has been drafted. A “present” vote can send a signal to a bill’s sponsors that the legislator might support an amended version. Voting “present” can also be a way to exercise fiscal restraint, without opposing the subject of the bill.
source:
http://www.nytimes.com/2008/02/16/opinion/16mikva.html?_r=1&th&emc=th&oref=sloginand this:
Mooney and other state capitol watchers and players say Illinois lawmakers often vote "present" as part of a larger party or issue bloc strategy.
Pam Sutherland is the president and CEO of the Illinois Planned Parenthood Council. She says Obama voted "present" at least seven times to provide cover to other abortion-rights supporters on such bills as the "Born Alive Infant Protection Act."
"Senators didn't want to vote pro-choice anymore, because they knew these were being used against them in their campaigns," Sutherland said.
source:
http://www.npr.org/templates/story/story.php?storyId=18348437and this:
“The ‘present’ vote is used, especially by more thoughtful legislators, not as a means of avoiding taking a position on an issue, but as a means of signaling concerns about an issue,” said state Rep. John Fritchey (D), an Obama supporter.
Sometimes using “present” votes is part of a larger strategy.
For example, in what was supposed to be the last night of the legislative session in 2002, the leader of the Senate Democrats said he had been double-crossed on a budget agreement when a major new revenue source was left out. His caucus didn’t have enough votes to stop the whole revenue package, which included cigarette tax hikes, and the Democrats agreed to most of the bill anyway.
“I’m going to recommend to the members of this side of the aisle to vote ‘present’ until such a time as we see a total package that’s going to balance the budget for the year 2003,” state Sen. Emil Jones Jr. (D) told his caucus.
source:
http://www.stateline.org/live/details/story?contentId=274863And there's much more.
How dare you dismiss someone out of hand with only a suggestion that you have any idea what you're talking about?
I'm a former IL Dem, and I often disagree with the bullshit that goes on there under the guise of legislation, but it's a far cry from Sen. Clinton's assertion that in IL, it's yes, no, or maybe.