What's at stake as voters cast ballots in six primaries, including South Carolina and Wisconsin

Primary elections are being held Tuesday in six states: Wisconsin, Minnesota, Alabama, Connecticut, Vermont and South Carolina. CBS News' Taurean Small, Jonah Kaplan, Mark Strassmann and Anthony Salvanto have the latest.

Primary elections are being held Tuesday in six states: Wisconsin, Minnesota, Alabama, Connecticut, Vermont and South Carolina. CBS News' Taurean Small, Jonah Kaplan, Mark Strassmann and Anthony Salvanto have the latest.