Conversation so far:
Why does Ron Paul decide to refuse to endorse the republican nominee?
Ron Paul said he would not endorse the main (both Democratic and Republican) parties' candidates because there were no differences between them, and neither would make necessary changes in governance.
What were the name of the main party candidatenominees mentioned Ron Paul refused to endorse?
Ron Paul said that under no circumstances would he be endorsing either of the two main parties' candidates (John McCain – Republican Party, or Barack Obama – Democratic Party).

Question: Who antagonized him?
Self-contained rewrite: Who antagonized Ron Paul?