Following Tim Pawlenty's lead, not yet presidential candidate Mitt Romney just made his first check in on Foursquare. Romney checked into “Mitt Romney’s National Call Day” in Las Vegas, Nevada. It is not clear whether it was actually Romney or one of his staff members who checked in using an iPhone. Just five minutes after Romney checked in, 39 other people had also checked in at the event. Perhaps the purpose of this and other campaign check ins will be to show how many people are showing up to Romney’s events.