After a rocky Republican National Convention in Cleveland this week, pollsters will soon be getting a feel for what registered voters think of the newly minted nominee, Donald Trump.  

Gallup compiled data going back to 1964 and found that only two candidates went down in the polls following their respective conventions. President Bill Clinton, who will again take the stage next week for his wife and presumptive Democratic nominee Hillary Clinton, had the biggest post-convention bump at 16 percentage points.