PORTLAND, Maine — Independent former Maine Gov. Angus King has won the race to succeed retiring Republican U.S. Sen. Olympia Snowe after vowing to go to Washington to try to fix the broken political process.

The former two-term governor overcame challenges from Republican Secretary of State Charlie Summers and Democratic state Sen. Cynthia Dill in an election with big implications for control of the Senate. Democrats held a 51-47 edge going into Tuesday’s elections.

King says he was inspired to run because Snowe described the Senate as broken. He cast himself as unbeholden to parties and able to broker compromise. He endured millions of dollars’ worth of attack ads from Republican and conservative groups.

Summers said he’d restore “fiscal sanity” to Washington. Dill cast herself as eager to continue President Barack Obama’s agenda.