Trump trails by 10, not leads by 10. Betting odds have Cruz at 90% chance of winning Wisconsin. Follow the money, not some one-off poll that fits your wishes.
The media is lying, as no one wants Trump to be able to run and win the general election. Except for real Americans, like you will never be. We will know by this time tomorrow, and if Cruzzy wins, then Hillary is the next President.
I say this as a non-American, watching through the lens of public broadcasting in another country:
The rest of the world is standing by appalled that anyone is even considering voting for Donald Trump. We thought it a cosmic joke at the beginning, but everything out of his mouth is ignorant, ill-considered, disrespectful, and foul. He lies endlessly, and his proposals won't work. His incitement of his supporters to violence at his rallies is disgusting.
He cannot build a wall, nor can he force Mexico to pay for it. He cannot tear up NAFTA and other signed trade agreements. He lies to you about endlessly. That you would even consider voting for this demagogue is frightening.