September 14 Primary Elections: The 8 Biggest Winners And Losers

On Tuesday, voters in seven states, as well as in Washington, D.C., took to the polls to determine which candidates in some of the year's most contentious primary races would advance to compete in general election match-ups come November.

In Delaware, Tea Party-backed contender Christine O'Donnell toppled establishment candidate U.S. Rep. Michael Castle in the state's Republican Senate primary. The conservative hopeful's win marked a major victory for the Tea Party in a race that pits the movement against the interests of the GOP.

Meanwhile, primary fights that culminated in Maryland, Massachusetts, New Hampshire, New York, Rhode Island, and Wisconsin also produced a handful of interesting, and in some cases unexpected, election outcomes.

Here's a rundown on who's up and who's down following Tuesday's primary races: