Democratic presidential candidate Bernie Sanders says Indiana's primary on Tuesday will be important to his goal of amassing as many delegates as possible to catch up with rival Hillary Clinton. Sanders says he has won 45 percent of the pledged delegates awarded so far but only about 7 percent of the superdelegates — the party leaders who can vote for either Democratic candidate but are overwhelmingly committed to Clinton. Ted Cruz is calling the Indiana primary "neck and neck" and says he'll stay in the Republican presidential race for as long as he has a "viable path to victory." Cruz is framing a potential fall election match-up between Donald Trump and Hillary Clinton as the choice between two "big government, New York liberals." [...] he has been trying to rally the politically diverse, working-class swath of voters in northern Indiana, where the industrial economy remains viable but union jobs have declined in recent decades. Trump is the only candidate in the race who can reach the 1,237 delegates needed for the GOP nomination through regular voting, though Cruz is trying to push the race toward a contested convention.