Update 6:08 p.m.: Snyder has signed the bill in private.

Update 2:01 p.m. MSNBC is reporting that Snyder will not sign the bill until tomorrow. 

Update 12:45 p.m. A sit-in at the Capitol has formed in the wake of the passing votes (via @JulianCummings):

Update 12:21 p.m. "Unhappy and depressed" our man in the Capitol is telling us about the mood there—protesters have just found out the House of Representatives have passed the bill. 

Update 12:14 p.m. Michigan's House of Representatives has passed the "right-to-work" bill by a vote of 58-51. 

Update 12:01 p.m. According to Reuters, the unofficial count of protesters seems to be over 12,000 people. And we don't know if there's been a shift-change in the Capitol building, but the policemen in riot gear are now in the building: 

Update 11:19 a.m.: We're talking to someone inside the Capitol building, and it appears cops are slowly letting people into the building. Service is apparently dodgy in there, hence the lack of Twitter pictures.  

"We have been yelling and asking for Snyder. He, of course, won't show his face. Now [the crowd is] screaming, we are the 99%" our correspondent told us. 

Here's another shot from inside the building: 

 

Update 10:42 a.m.: The Lansing State Journal's Laura Misjak is doing some excellent work and giving great details of what's happening at Michigan's Capitol building. Here's a view from the building's 4th floor:

 

OriginalGovernor Rick Snyder will be signing legislation today to make Michigan the country's 24th right to work state — and these are the protestors who still don't want that to happen. 

The Time: There appears to be no exactly timeframe for when Snyder will be signing the law, actually. But we're expecting something early: 

The Cops: Last week police in Michigan's Capitol building sprayed mace to control the crowd in Lansing. Today they're apparently donning riot helmets in anticipation: 

And this is what it looks like as you walk into the Capitol building (Maury Koffman via Facebook): 

The Protesters: 

One of the more inventive signs:

One more shot via @KristenDaum:

Here are protesters and cops being civil (via WDIV Detroit): 

And here's video of members of the United Auto Workers union rallying this morning

Again, protesting is all the pro-union people can do at this point — Snyder's law and Michigan's heavily Republican legislature have ensured that Michigan will indeed become a right-to-work state and chip away at the effectiveness of unions there. We'll keep this updated as the day and the protest goes on.