ALTOONA (AP) - Donald Trump is planning to make his first campaign visit to Wisconsin on Tuesday, where the upcoming Republican presidential primary could mark a turning point in the unpredictable GOP race. But rival Ted Cruz has gotten a head-start on the contest, racking up influential endorsements, campaigning in key regions and supported by bullish advertising campaign. A solid Cruz win in Wisconsin would narrow Trump's path to the nomination, heap pressure on the billionaire to sweep the remaining winner-take-all primaries this spring, and increase the chances of a contested party convention in July.