Poll finds Santorum up by double-digits in Ohio  —  Fresh off his victories in Michigan and Arizona, Mitt Romney will need to pull another come-from-behind effort to take Ohio on Super Tuesday, a new poll shows.  —  Romney trails Rick Santorum by 11 points in the latest Ohio Poll from the University of Cincinnati.

After tough race, Romney beats Santorum in Michigan primary  —  Mitt Romney re-established himself as the Republican front-runner Tuesday night with his win in Michigan's pivotal primary, fending off what would have been a crushing defeat by rival Rick Santorum.

5 takeaways from Arizona and Michigan  —  Mitt did it.  —  After a brutal and nail-biting build-up, Mitt Romney emerged from two primary contests Tuesday night with important victories under his belt, and Rick Santorum's momentum was stalled.  —  Below are POLITICO's five takeaways from Arizona and Michigan:

Michigan and Arizona primaries 2012: Mitt Romney wins ugly  —  NOVI, Mich. - Mitt Romney may have won ugly in Michigan, but his narrow victory will temper the mounting criticism of his candidacy, even though his resilience is about to be tested again in some of the biggest prizes of Super Tuesday.

Maine Sen. Olympia Snowe to retire in blow to GOP  —  Maine Republican Sen. Olympia Snowe will not seek reelection in 2012, she announced Tuesday.  —  Sen. Olympia Snowe (R-Maine) on Dec. 17, 2011, after leaving the floor of the Senate.  (J. Scott Applewhite - AP)

Playbook: Leap Day edition  —  TO TELL THE KIDS -USA Today 1A, “What if there were no leap years? ...  [T]he calendar would be ‘scrambled,’” by Dan Vergano: “[T]he Earth doesn't circle the sun in exactly 365 days [but] 365.2425 days ... Those extra digits add up to almost a full day, but not quite, every four years. ...