Right from the start, front-runners Donald Trump and Ben Carson, who have no experience in politics, were under attack.
BBC says that Ohio Governor, John Kasich, condemned their “fantasy tax plans” and ridiculed their lack of political experience, stressing that “we cannot elect someone who does not know how to do the job”.
Mr Carson, a retired neurosurgeon who has edged past Mr Trump in national polls, had a quiet night in Boulder.
His tax plan, which is based on biblical tithes, was decried as “fantasy” by Mr Kasich, who also condemned Mr Trump’s plan to deport 11 million undocumented immigrants and build a wall on the Mexico border.
Political friendships were also strained by some of the testy exchanges, notably between former Florida Governor, Jeb Bush and Florida Senator, Marco Rubio.