The human oops factor caused more upset than technology failures in Tuesday's balloting, according to the complaints of confused, frustrated or angry voters. The most reported problem: Democrats couldn't vote in their party's presidential primary because poll workers pushed the wrong buttons to activate their voting machine key cards. Some caught the error in time, but others realized it only after voting in municipal races and then asking why their ballots didn't have the presidential primary. They said they got either apologies for the mistake or blame for not speaking up sooner, but in either case, they didn't get to...