Hillary Clinton leads a hypothetical Republican presidential field , according to a new poll . Mitt Romney tops the Republican side for the 2016 nomination . The Mitt Romney has a sprawling field of just 4 candidates leading into 2016 .
Mitt Romney leads a hypothetical Republican presidential field , according to a new poll . Hillary Clinton tops the Democratic side for the 2016 nomination . The GOP has a sprawling field of up to 16 candidates leading into 2016 .