In my opinion the two candidates that will stand to replace Barack Obama in the US general Election are Hillary Clinton and Donald trump.
Hillary Clinton is a Democrat and Trump is Republican. They are dominating the primary elections and it appears clear to me.
There may be internal conflict for Lady voters that are loyal to the Republican party. They may think the republican party gets better results but want to see Hilary lead because she is an experienced politician and a lady, she would probably want to finally close the door on gender equality. American women still earn less then men and Hillary is very likely to bring legislation that promotes fair pay to both genders. And she wants to make it easier to be a parent I believe.
Trump is a very successful business man and probably has a sound plan for breaking up the huge dept owed by the American government without causing much chaos although he has some very extreme views that I think are crazy.
Hillary Clinton is also likely to have a very good plan for American dept control and economic growth because she has been in the business for a long time and knows what works and what doesn't.
All I know for sure is that things will heat up in the months just before November and it will be a very close call.