WASHINGTON -- Mitt Romney would stand to benefit just as much as Rick Santorum if Newt Gingrich exited the presidential race, according to a new poll released Friday. The Gallup poll defied conventional wisdom by suggesting Romney would peel off just as many Gingrich supporters as Santorum would. Forty percent of Gingrich supporters in Gallup's daily tracking poll said Romney was their second choice while 39 percent said they would migrate to Santorum. "If two candidates for a presidential nomination compete in the same ideological space, it would make sense that if one dropped out that the other would benefit,"...