The radical right is once again being expected to vote for a candidate like Urrutia simply because he is not Maduro. The centrists try to placate the right that they'll get a better candidate in the future, but for now they just can't let Maduro retain power and continue to destroy the country.
I'm sorry, but until the centrists are willing to nominate someone whose policies will be very popular with the people, they will continue to lose.