A new SurveyUSA poll sponsored by KING-TV shows support for Sound Transit's latest Proposition 1 measure that would expand mass transit, but the proposition's electoral outlook gets much closer when voters are aware of the proposition's $18 billion price tag.

When simply asked whether they supported the measure, respondents said yes 49 percent of the time compared with 30 percent who did not favor the measure.

However, the sampled who were also told about the proposition's cost only favored the bill by a 43-37 margin.

The poll, which split the way the question was framed, asked a total of 503 likely voters from the transit district, found a combined count of 47-33 in favor, and claims a margin of error of +/- 4.5 percent.