What must Republicans do to get 60+ seats in the Senate in 2012?

[True Federalist (진정한 연방 주의자)]

They can't as the GO Pdoes not stand to gain from anything worse than a mild double dip recession.  If the economy goes way bad way fast then it'll be because of foreign events clearly not under any Administration's ability to influence.  Indeed, a catastrophic European collapse could actually prove beneficial to the Democrats if the collapse is seen as being due to business policies that the GOP supports, not that will help the Dems much in the Senate since they picked the cupboard so clean in 2006, but it could give the Dems a chance to regain the House.

The absolute best I can see the GOP getting to in the Senate after the 2012 elections is 59, with 52 being probable, and falling to 45 being the worst possible.