With Cruz and Trump neck and neck in Wisconsin, this has become an important state for Ted (I hestiate to use the term "must win" but basically all the remaining primaries are critical for Cruz). Wisconsin is a winner take all state and with 42 delegates that is important.
Nate Silver says Cruz favored to win Wisconsin (he is giving him an 80% chance), then again, Nate Silver said Trump has a very limited shot at winning the nomination. YMMV The primary is April 5, and Cruz is putting a heave presence in now for a reason.
Right Wisconsin: For Cruz
RedState: Big poll for Ted Cruz
Instapundit: Ted Cruz, Truthbuster?
Larry Sabato: Assessing Trump's Path to Clinching The Nomination
Hot Air: Cruz gets an affirmation nod by John McCain?