Jimmy Carter was winning in March of 1980 as well, by a big margin
I guess you believe Jimmy got his second term, the polls in march said he did
Polls change, I get that.
But those who say that Cruz can’t win and only Trump can ignore the fact that as of right now the polls say the exact opposite.
Since those same people use poll numbers to prove their point that Trump will win the nomination in a tsunami, it seems worth pointing out that both their assertions (i.e. Trump is sweeping the nomination AND Trump is the only one who can win in the general) are not supported by the polls.
If your messaging lives by the polls, it dies by the polls.