The Arizona congressman will likely bedevil Republican leaders for another term.
Some voters waited up to five hours to cast their ballot.
"I finally find somebody I want to vote for, and they deny me."
In a TMFS sketch, we attack the five hour plus long wait to vote in Maricopa County, Arizona.
Though polls closed at 7 p.m., the last vote didn't come in until after midnight.
Clinton also won Arizona's 2008 Democratic primary.