Trump dropped 9 points in the new poll but remained in first place.
Blog Briefing Room
President Obama, Speaker Paul Ryan and Ben Carson are expected to attend.
McKesson gained prominence on social media during protests in Ferguson and Baltimore.
Carter calls Trump more "malleable" than Cruz.
Trump is speaking to supporters in Little Rock, Ark.
The Fox News personality said CNN's coverage "really hurt" Carson.
Gilmore noted he outlasted Rand Paul and Rick Santorum in the GOP presidential race.
She said there is a "lack of accountability" in the Cruz campaign.
The Democratic candidate says she "knew a lot of people" in New York.