9:44p.m.: On MSNBC, Tom Brokaw calls Mitt Romney a "young man." And they say show business is only for the young. (That is a thing they say, right?)
9:43p.m.: Continuing to speculate about Gingrich's campaign funds, you can't help but note the terrible lighting and awful audio at this Gingrich speech in Georgia:
9:41p.m.: Note the handmade pro-Newt sign -- a heartfelt sign of devotion or a sign of a lack of money?
9:39p.m.: Ron Paul refers to Santorum's charge that Paul and Romney have a pact to attack the senator as "someone who believes in conspiracy theories."
9:34p.m.: A national poll earlier this week found Santorum faced no gender gap. But in Michigan, Romney did much better among women than men, according to CNN exit polls. Among men, Romney won just 39 percent to 38 percent. But among women, he won 42 percent to Santorum's 37 percent.
9:32p.m.: "Look on the bright side, conservatives. The UAW wanted Santorum to win. You beat 'em!," Slate's Dave Weigel tweets.
9:30p.m.: A pretty adorable moment between the Santorums in Michigan today:
(Photo via Associated Press.)
9:22p.m.: Given Santorum's very good performance among Democrats voting in the Republican primary (50 percent voted for the former senator), Romney's campaign is going to keep talking about the Santorum campaign's robocall urging Democrats to pick Santorum, BuzzFeed's McKay Coppins reports. They'll accused Santorum of "supporting the liberal Democrat line against" Romney.
9:20p.m.: Of those who want illegal immigrants to be deported, 43 percent voted for Romney, Fox News reports. Of evangelical Christians, 38 percent voted for Santorum, while 33 percent went for Romney.
9:18p.m.: With 30 percent of precincts reporting, Romney is ahead 41 percent to 38 percent.
9:13p.m.: The candidates might not want to be associated with George W. Bush, but not all their fans feel that way. A woman wears a Bush shirt at Romney's election night party:
(Photo via Associated Press.)
9:10p.m.: More from exit polls: 40 percent of Michigan primary voters supported the Detroit bailout. Electability was the top issue for the plurality of voters, 33 percent. Strong character was most important for 23 percent, and being a true conservative was the most important thing in picking a candidate for 15 percent.
9:02p.m.: Victory in Arizona, Wolf Blitzer says, is "nothing to sneeze at." Exit polls show he easily won "somewhat conservative" voters, as well as moderates. He won those who picked the economy as the top issue, 49 percent to Santorum's 28 percent.
But Santorum won half of "very conservative" voters.
9:00p.m.: CNN calls Arizona for Romney, giving him about 44 percent. He gets 29 delegates. Michigan is too close to call.
8:58p.m.: CNN reports Santorum did get a teeny bit of benefit from liberal pranksters voting in Michigan. 10 percent of the voters were Democrats, and half of them went for Santorum. That's a net gain of 3.5 percent for the former senator.