Romney only recently stopped beating up on Santorum, Newt and the rest of the GOP hopefulls. As shown by the fundraising, Republicans are uniting and sending Romney the cash he needs to wage a hard hitting campaign.
Obama seems intent on stepping on his toes and losing focus on the economy and the number one issue.
Also, Obama's popularity numbers don;t bode well for re-election
http://campaign2012.washingtonexaminer.com/blogs/beltway-confidential/gallup-obamas-approval-below-reelection-standard/364946