Some comments from the Reddit thread covering the debate:
"Really enjoyed the debate without Trump. Switched from Rubio to Paul tonight."
"Rand Paul is by far the best Republican in the field."
"Paul had a really strong debate. A dark horse for 3rd in Iowa maybe?"
"Great answers on foreign policy, the NSA and especially when it came to body cameras. He came across as very informed when criticising fines as revenue and the War on Drugs. Not sure if it’ll translate to a campaign boost but he’s definitely the winner of this debate."
"Rand Paul fired a great bit shot at Hillary tonight.
Hillary can't say she is for women's equality. If the Clinton Foundation is taking huge sums of money from countries that oppress women."
"Rand Paul at least seems like he'd be capable of doing the damn job."
"Rand didnt just look good up on stage he looked down right comfortable, poised even. Dolling out body blows to the other candidates."
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He definitely won over some independent/on the fence voters tonight while at the same time hopefully squeezing some of Cruz's support.