While Mitt Romney (R) has improved his chances of becoming the GOP's 2012 presidential nominee by keeping a low profile, Mississippi Gov. Haley Barbour (R) is taking a page from the same playbook. CQ Politics notes if anyone knows how to win the Republican party's presidential nomination, it's Barbour. Whether the 61-year-old Mississippi governor can successfully apply that know-how in 2012 -- and whether he wants to -- are questions that will begin to be answered this week as he launches what many political observers see as an exploratory venture into presidential primary proving grounds.