Here comes the big Republican debate...

Eleven candidates will take the stage at the Reagan Presidential Library in Simi Valley, California, Wednesday night for the second round of Republican presidential debates.

We'll be live blogging the debate, set to begin shortly, right here.

CNN changed its debate criteria to allow former Hewlett Packard CEO Carly Fiorina, who was excluded from Fox News' main debate in August, to join the same 10 candidates who took the top-tier stage last month.

Rick Santorum, Bobby Jindal, Lindsay Graham, and George Pataki participated in the lower-tier debate earlier this evening.

That leaves Ben Carson, Jeb Bush, Ted Cruz, John Kasich, Marco Rubio, Scott Walker, Chris Christie, Mike Huckabee, Rand Paul, Carly Fiorina, and, of course, Donald Trump.

According to Real Clear Politics' average of six recent national polls, Trump is leading the pack at 29.8% (up from 24.3% before August's debate), followed by the retired neurosurgeon Carson at 17.8% (up from 5.8%) and Bush, the former Florida governor, at 7.8% (down from 12.5%).

Here's how the rest of them stand:

• Ted Cruz, US senator from Texas: 6.7% (up from 5.5%)
• Marco Rubio, US senator from Florida: 5.8% (up from 5.3%)
• Mike Huckabee, former Arkansas governor: 4.3% (down from 6.8%)
• Carly Fiorina, former Hewlett Packard CEO: 4.3% (up from 1.3%)
• Scott Walker, Wisconsin governor: 3.8% (down from 9.5%)
• John Kasich, Ohio governor: 3.5% (up from 2.8%)
• Rand Paul, US senator from Kentucky: 2.7% (down from 4.5%)
• Chris Christie, New Jersey governor: 2.0% (down from 3.5%)

Wednesday night's debate will be moderated by CNN correspondents Jake Tapper and Dana Bash, as well as conservative radio host Hugh Hewitt.

Check below for updates throughout.