This is despite the fact that in a recent election survey all respondents said they are loyal to one of the two main parties. But a third of voters in each of the two main parties say they are so disenchanted with their platforms that they would join a third party if it were formed. Yet even if the poll reflects the views of the electorate as a whole, the new party has no chance of attracting a third of the vote.
the meaning of the passage?
Nearly half of all respondents reported that they were more likely not to vote for either major party than to switch votes between them