DailyKos is an anti-semitic site. Tell your cousin to get off of that site.
Tell your cousin that Obama wants to meet with the president of Iran without pre-conditions. Tell him or her that the president of Iran is a Holocaust denier, who wants to "wipe Israel off the map."
Mention how Obama is tied to a radical group, ACORN, which helped cause the mortgage crisis.
Say how Obama has had a 20+ year relationship with Jeremiah Wright, who openly supported Hamas and the PLO and who gave an award to Jeremiah Wright.
Also, say how Obama has been dishonest about Willaim Ayers.
Obama worked closed with Ayers and got money funneled to projects that Ayers was working on. Ayers promotes radical versions of education that attempt to indoctrinate and radicalize students.
Obama endorsed a book of Ayers and wrote a blurb in the inside of Ayers' book.