The campaign of Democratic presidential candidate Bernie Sanders is raising questions about the involvement of Microsoft in the Iowa Caucuses, now just five days away, and has built a independent system to check the official results. For the first time this year, Microsoft partnered with the Iowa Democratic and Republican Parties to provide a technology platform with which the parties will run their caucuses. The software giant created separate mobile apps for each party, which officials at hundreds of caucuses across the state will use to report out results from individual precincts to party headquarters for tabulation. The arrangement has...