Republicans have their best shot in years at taking back the Senate in 2014, but a lot has to break their way

◼ They have to pick up just six seats and defend 14, unlike Democrats who have to defend 21 seats. - Politico

The mood is right for the GOP: The president is unpopular. The economy is still lagging. And Obamacare has ticked off independents.

But Republicans blew it in 2012, letting the Senate slip away despite favorable circumstances. Democrats, meanwhile, will do their best to hang on, distancing themselves from the president and his health care law.... POLITICO has winnowed down the list to the 10 matchups that are most likely to flip between parties — and decide who will control the Senate.