Mitt Romney is once again gaining more new Facebook fans per day than any other Republican Presidential Primary candidate, according to our Inside Facebook Election Tracker.

Romney won the Michigan and Arizona primaries on Tuesday and has since pulled ahead of the other candidates as far as the number of new page Likes he gets each day. His fan growth had slowed significantly over the course of the month as Rick Santorum gained steam. Somewhat surprisingly, each candidate saw far fewer new fans on the most recent election day.

None of the candidates has switched their fan pages to the new Timeline format, although President Barack Obama and several members of Congress have. Gingrich created a personal profile in February, but he has only picked up 6,360 subscribers. Now that pages can tell their story through Timeline, there is less reason for candidates to divide their audience between pages and profiles.

We look forward to candidates switching to Timeline so we can see additional insights about the demographics that Like each page.