First, 60% does not sound like too much (makes you think that 40% agree) until you see that only 2% actually agree with it.
Second, the question is not about UBI in general, but about a very specific proposal: "[U]niversal basic income of $13,000 a year — financed by eliminating all transfer programs (including Social Security, Medicare, Medicaid, housing subsidies, household welfare payments, and farm and corporate subsidies)".