The primaries on the Democratic side will not have many attacks of each others character. Sanders never has attacked his opponent's character, and Clinton will probably respond in kind.

On the other hand, the Republicans will. This might not be done in television attack ads. They will come in stump speeches, and interviews. Trump, due to his personality, and use of absolutes, will attack anyone that questions his past, or qualifications for the presidency. Everyone expect Bush, Walker, Paul, and Cruz will attack Trump's personality to get a raise, if possible, in the polls.

The 2016 general election, due to all the political action groups, and their money, destroying their opponents character will be the name of the game. It is going to be unbearable to watch. I hope that it gets so bad that the president and Congress to be will do something about the 501(4)c charitable political action groups. Enforce the IRS law as written in the early 50's. Do not let these groups perform any political activity. They can do it, but the IRS law that makes their donor's name public.